NOTES FROM LUKE: The Worker 9KG is an upgrade spring kit for your Nerf N-Strike Stampede Blaster. Stainless steel construction and a 9kg rating. This kit Includes all the goodies to install your spring.
FEATURES: -Compatible with Nerf N-Strike Stampede ECS -Mid-weight design -Easy to install
SPECS: -9KG rated spring -Stainless Steel -Weight: 70g -Model: W0076