Thank you very much for viewing this item. This is the Mini 4WD Atomic Tuned Motor 2. I have checked its operation and measured the RPM. Please note that this is a measurement by an amateur, so consider it as a guideline only. I used new alkaline AA batteries purchased from KOHNAN. Since it is old, there is age-related deterioration. 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, no refunds, and no exchanges. [Shipping Method] I will wrap it in cushioning material and ship it via Yu-Packet Post Mini (anonymous shipping).