HQ Bullnose Propellers replicate the performance of "cut down" propellers, eg. the 5x4.5 bullnosenose prop is modeled after a cut down 6x4.5. The resulting "bullnose" profile is stiffer, higher thrust and can be fitted to smaller airframes that an uncut prop might not fit on. The props come in both glass and carbon reinforced composites and are complete with 3, 4, and 5mm i.d. adapter sleeves . Sold as pairs.