Thank you very much for viewing this product. This is a Mini 4WD Mach Dash PRO motor. I have checked the operation and measured the rotation speed. Since this was measured by an amateur, please consider it as a guideline. I used new alkaline AA batteries purchased from KOHNAN. It is an old item, so there is some deterioration over time. Please check the images carefully for scratches and dirt. Feel free to ask any questions you may have. Please purchase only if you understand that this is an as-is item, and with no returns, refunds, or exchanges. [Shipping Method] I will wrap it in cushioning material and ship it via Yu-Packet Post mini (anonymous shipping).