1、Use aluminum alloy, strong and durable. 2、The wheels are made of durable aluminum alloy and rubber, ensure accurate motion without shake. 3、Help you create dynamic shots on the platform, ground, etc. 4、Precise calibration can help you slide the phone and mirrorless camera. 5、Equipped with 1/4 screws in the middle, to quickly connect the mobile phone holder, gimbal for short-distance photography. Features: Use aluminum alloy, strong and durable. The wheels are made of durable aluminum alloy and rubber, ensure accurate motion without shake. Help you create dynamic shots on the platform, ground, etc. Precise calibration can help you slide the phone and mirrorless camera. Equipped with 1/4 screws in the middle, to quickly connect the mobile phone holder, gimbal for short-distance photography. Compatible with all ball heads and magic arms. Specification: Color: black Material: aluminum alloy, rubber Dimensions: Approx. 70 x 85 x 16mm / 2.8 x 3.3 x 0.6in Weight: Approx. 173g Package List: 1 x Video DollyNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.