Fine workmanship and durable in use. The gear ratio of 40 steel helical gear is 8/30 which has perfect size and stable performance. Upgrade parts for rc car models. Suitable for Axial for SCX10 II model upgrade bridge axle. Manufacturered by EAPTS. 100% brand new and high quality. Material: Metal Steel. Package Size: app.9x6.5x3cm/3.54x2.56x1.18in. Sturdy metal construction gear strong and durable. Low friction and high torque transmission. Package includes: 1 x 40 steel 8 teeth;1 x 40 steel 30 teeth(other accessories demo in the picture is not included!). Easy to use stable performance. Easy to install and durable it fits perfectly making your RC car cooler and more attractive.