8Pcs 4mm Blue Anti Vibration Damping Ball for FPV Gimbal Camera Mount Product Name : Damping Ball;Hole Dia : 4mm/0.16 Central Outer Dia : 8.5mm/ 0.33;Damping Ball Height : 13mm/0.51 Material : Rubber;Main Color : Blue Net Weight : 6g Package Content : 8 Pcs x Damping Ball