It is recommended to match the worker's Third Generation W0206(Worker Mod Diamond Pattern Accurate Type Flywheel Update Sets for Nerf STRYFE/Rapidstrike CS-18 Color Blue) and W0315(Worker Mod Flywheel Diagonal Mental Type Update Kits for Nerf STRYFE/Rapidstrike CS-18/Swordfish Toy); with these 2 flywheel sets the test results are excellent. Can also be paired with a double flywheel set three flywheel set. Model:W0345Package Weight:186gPackage Size:120x100x40mm Manufacturered by Worker F10555. Please notice this kits need some installation skills so it is generally not suitable for people under 14 years of age.All the parts are separate and you need to reassemble them. Blaster not included! Compatible with Worker Mod Dominator blaster.