Maple Leaf Monster (Diamond) Hop Up Rubber for KSC / KWA System 7 II GBB
Basically describes the back spin trajectory of an BB pellets, by adjusting the Hop-Up to increase their range and accuracy
As the pellet shoots through this hop up bucking, the friction creates the spin, it tends to roll and backspin.
The "concave" shape bucking, it will provide you the best hop up effect ever and is made specifically for the KSC / KWA System 7 II GBB such as the M11A1.