The size of the belt can be adjusted depending on what size you are

You get lots of features with this scope

belts or backpacks

which corresponds to 12W

so you can easily and quickly switch from semi to full auto when shooting

A2A Cheetah High Speed Motor Lang 60cm The size of the beltA2A High Speed motor with long shaft for upgrading electric softguns. The motor is equipped with powerful neodymium magnets, ball bearings and steel pinion gears. Suitable for tunings with springs up to M130, provides a significantly higher firing rate than standard engines. We recommend that for best performance, the motor is used with our series of A2A lipo batteries.