OMPHOBBY M4 Helicopter Idler Pulley Set(Black)OSHM4020B Sale! from 1038 /per Qty. Add to Cart This is a replacement idler pully set for the OMPHOBBY M4 Helicopters Contents Idler Pulley -2Bearing Φ3xΦ6x2.5-4Bushing Φ3xΦ4x2-2socket cap screw M3x14-2Idler pully cone-2 Qty available:1 SKU:OSHM4020B