The Umarex Fusion 2 (multi-shot) air rifle has three grooves in its bolt handle. Fitting O rings into these grooves improves ease of use and comfort operating the bolt.
This kit comprises three conventional round O rings, plus three O rings of unusual, square section. You can install either set on your gun by simply rolling them over the bolt handle.
The square section O rings provide a more aggressive grip to the bolt handle. The round ones are more comfortable. Fit the ones you prefer!
These O rings are intended for use with the new, multi-shot Umarex Fusion 2. They do NOT fit the original, single-shot Fusion 1.