The carbon brush size is 22x11x7mm/ 0.86x0.43x0.27inch. Compatible with Drive Envoy 4, 6, 8 mobility scooter. Also suitable for a variety of mobility scooters. Make of good quality carbon and copper, sturdy and durable, ideal replacement for your old or worn one. Worn brushes are often the cause of a poorly running motor. Replacing brushes can fix an intermittent motor and can restore a motor's electric braking. Please measure your carbon brushes to match the size before you purchase. Size 22x11x7mm/ 0.86x0.43x0.27inch Material Carbon, Copper Type Carbon Brush Brand Unbranded/Generic MPN MEM94927175356 EAN 4894927175356.