AIRSOFTPEAK Tactical Pistol Breacher's Shotgun Scabbard Holster Molle Rifle Sling Case Bag for Outdoor Hunting Black Made of Stainless Steel Shim set include: 0.1mm x 10pcs (octagon) , 0.15mm x 10pcs (circle) , 0.2mm x 14pcs (copper circle) Replace your AEG Original Shim with this upgrade kit Designed for all version gearbox