Check the listing for details. K26 & K25 Spring Combo For Modding Nerf Blaster Kronos Saturn Pilot Upgrade Mod. Condition: New. Listed at 9.99 USD. K26 & K25 Spring Combo! - 1x K 26 11" and 1x K 25 Eleven Inch Compression Coil Springs For Nerf Mod Projects - Modding Toy Gun Part Popular High Powered, High Tension Springs Commonly Used for Nerf Projects and Mods! Compression Stock Springs - Spring Tempered Steel K26 Specs:- 11" Long- 0.844" Outside Diameter- 0.684" Inside Diameter- .080" Wire Diameter- .24" Coil Space- 3.88 lbs/Inch K25 Specs:- 11" Long- 0.969" (24.5 mm) Outside Diameter- 0.809" (20.5mm) Inside Diameter- .080" Wire Diameter- .375" Coil Space- 3.50 lbs/Inch Great for modding Several Rival, Hyper, & Mega Nerf Blasters K25 Upgrade Examples: Pilot RivalFate RivalPathfinder RivalForerunner RivalVision RivalSaturn RivalTakedown RivalReaper RivalFinisher RivalSideswipe RivalHelix Rival Rush 40 HyperSiege 50 Hyper HC-E Mega K26 Upgrade Examples: Kronos RivalHades RivalRoundhouse RivalMercury RivalHypnos RivalHelios RivalArtemis RivalJupiter RivalApollo RivalHeracles Rival *Will need to be cut to different lengths in different blasters - Toy Gun Part