Aim Top 65 Degree Hop Up Bucking 2pcs

The Aim sports 65 Degree Hop Up Bucking 2pcs is made for use in AEG/HPA type airsoft devices and is a somewhat stiffer type of bucking.

The 65 degree says something about the stiffness of the rubber and is the higher the number of degrees the better they combine with heavier type bb's. 65 Degrees is nice to combine with bb's in a weight class of 0.25 to 0.30gr.
Note that the heavier the bb's the faster the bucking will wear out.