Double Board enable you have enough space to install various board. Motor speed ratio: 1:48. 60mm size wheel x 4pcs. Note: The product color is only black available.Usually it cost about 35USD-50USD. If you receive defective item, please kindly notify us within 14 days. The item "DIY DC 4WD Smart Robot Car Chassis Kit With TT Motor 60mm Wheel For Arduino ht55" is in sale since Wednesday, November 13, 2019. This item is in the category "Business, Office & Industrial\Electrical Equipment & Supplies\Other Electrical Equipment & Supplies". The seller is "cybereveryday" and is located in Shenzhen. This item can be shipped worldwide.