OMPHOBBY M4 Helicopter Bearing ∅5x∅10x4mm OSHM4088 Sale! from 491 /per Qty. Add to Cart This is a replacement bearing ∅5x∅10x4mm for the OMPHOBBY M4 Helicopters Contents bearing ∅5x∅10x4mm-4 Qty available:1 SKU:OSHM4088