27" Vess Props Type "A".
The "A" pitch has slightly less pitch than the baseline "B-series" for use on 100cc or similarly powered aerobatic aircraft that are larger, heavier, or have more drag than a typical 33% model. Also useful to provide addtional RPM at high atmospheric temperatures or field elevations.
The "B" pitch is a baseline propeller for use on a typical 100cc or similarly powered 33-35% aerobatic model. It provides fantastic 3D and aerobatic perfomance with reduced noise.