Product Description

The Spyderco Endura 4 C10FPK390 is the full-size K390 Endura — Böhler K390 tool steel delivering extreme edge retention substantially exceeding VG-10 in a 3.80-inch full flat ground plain edge blade, Blue FRN handle, and back lock, bringing K390's non-stainless performance ceiling into the Endura 4's full-size working folder format that provides significantly more blade reach, cutting leverage, and sustained cutting session performance than the compact Delica 4 — the right Spyderco full-size FRN folder for buyers who want extreme edge retention in a working blade that handles everything a compact EDC cannot at $160.

The K390 blade is Böhler's high-performance non-stainless tool steel — a high-carbon, high-vanadium powder metallurgy steel that delivers extreme edge retention substantially exceeding VG-10 and most PM stainless steels, placing it among the highest-performing non-stainless steels in production folder history. In the Endura 4's 3.80-inch blade format, K390's edge retention advantage is most practically expressed — a full-size working blade that holds its working edge through the sustained cutting sessions, extended food prep, and heavy daily cutting tasks that a compact Delica 4 reaches its limits on, without the resharpening intervals that VG-10 requires in the same blade length. The tradeoff for K390's extreme edge retention in the Endura 4 format is the same as in the Delica 4 — a non-stainless steel requiring cleaning and light oiling after moisture or acidic food exposure to prevent patina and rust. For buyers who carry the Endura 4 as a working daily folder and maintain their own edges on diamond equipment, K390's sustained performance across a full working day's cutting significantly reduces the resharpening frequency that VG-10 demands at the same blade length. The full flat grind maximizes K390's cutting geometry by thinning behind the edge across the full 3.80-inch blade width — the geometry that makes the Endura 4 one of the most efficient full-size working folders at its price point, here applied to a steel that holds the resulting edge geometry significantly longer than VG-10. The Blue FRN handle is Spyderco's signature compact and full-size FRN EDC colorway — the same blue across the Delica and Endura family that signals Spyderco's accessible FRN performance identity.

• Blade: K390 Böhler tool steel, drop point profile, satin finish, plain edge, full flat grind — non-stainless high-carbon high-vanadium PM tool steel with extreme edge retention substantially exceeding VG-10; 3.80-inch full-size working blade delivers more cutting leverage and sustained session performance than compact Delica 4; requires diamond stones for sharpening; requires cleaning and light oiling after moisture or acidic food exposure
• Handle: Blue FRN (fiberglass-reinforced nylon), textured bidirectional grip, full-size Endura 4 profile — chemically inert and lightweight; Blue is Spyderco's signature FRN colorway across the Delica and Endura family; full-size Endura 4 profile suited to belt carry, larger pocket carry, and sustained working folder use
• Deployment / Lock: Back Lock via Spyderco Round Hole — back lock provides reliable blade security in the full-size Endura 4 platform; ambidextrous Round Hole allows one-hand opening from any grip position
• Carry: Approximately 3.00 oz, tip-up right-hand wire clip, full-size Endura 4 profile — K390 extreme edge retention in full-size format at $160; $20 more than the K390 Delica 4 C11FPK390 for the full-size blade length and working format

Ideal For

Performance-focused working folder buyers who want K390's extreme edge retention in the Endura 4's full-size working blade format — the C10FPK390 at $160 delivers K390's non-stainless edge retention ceiling in a 3.80-inch blade that handles the sustained cutting sessions, extended food prep, and heavy daily cutting tasks where the compact Delica 4's blade length limits practical working performance, suited to buyers who sharpen their own knives on diamond equipment and want a full-size working folder that goes significantly longer between sessions than VG-10 allows. Buyers who carry the Delica 4 K390 C11FPK390 as their compact EDC and want the same K390 steel in a full-size working folder — the C10FPK390 delivers K390's performance in the Endura 4's full-size format, maintaining the same diamond sharpening requirements and non-stainless care protocol in a blade that provides 0.85+ inches more working reach than the Delica 4 K390. Buyers who want the Endura 4's full-size working format with K390's performance ceiling over VG-10's accessible stainless specification — the C10FPK390 at $160 delivers extreme edge retention in the full-size Endura 4 at $60 more than the VG-10 Endura 4; the additional cost is K390's meaningful edge retention advantage over VG-10 in the sustained cutting contexts where the Endura 4's blade length is regularly used.

K390 tool steel that delivers extreme edge retention substantially exceeding VG-10 in the Endura 4's 3.80-inch full-size working blade format, a full flat grind that maximizes K390's cutting geometry across the full working blade length, Blue FRN in Spyderco's signature FRN colorway, and the back lock in Japan's most refined full-size production folder — the Spyderco Endura 4 C10FPK390 is the K390 full-size working FRN folder at $160. Add the Spyderco Endura 4 C10FPK390 to your cart today and get same-or-next-business-day shipping from Columbia, Louisiana, backed by Spyderco's lifetime guarantee. Questions? Call 888-225-9775 — we carry these knives daily.