This is the JLB J3 Speed RC Car Upgrade Parts,EA1005 Upgrade Metal Bottom Arm Holder,Arm code plate.Total 4pcs.There are 2 Color you can choose.The weight of this kit is 24g.The size of this kit is 59.5mm*12.7mm*5.5mm.1/10 JLB J3 Speed RC Car Replacement Accesories.