WORKER Mod 9KG Modification Upgrade Spring Kits for Nerf N-Strike Stampede ECS Compatible with Nerf N-Strike Stampede ECS 100% New and high quality. It can promote shooting range and dart speed. This spring is only for Nerf Blaster toy,All parts are separate,and the product included small parts, you need to install and assemble your blaster,Please be careful installing the parts to avoid damage to your Blaster! Blaster not included!