This is the Holmes Hobbies TRX-4M Torquemaster Mini Brushed 180 Motor. Designed with performance in mind the Torquemaster Mini uses premium components and high quality construction making this an excellent performance option for the TRX-4M rock crawler. Available in multiple turn counts the 66T motor gives you a noticeable boost in wheel speed while the 87T option offers a high quality, more efficient replacement for the stock TRX-4M motor. Package includes one 180 size motor with pinion pre-installed.