Description:Feature - 100% Brand new and .Provides a convenient choice for your DIY projectApplication - Plastic Crown Gears suit for a science DIY projects such as rc model car, model electric robot and windmill, education such as displaying how gear rates work, and any other family small motor DIY project.More Choose - Our store have the most complete specs gears shown in the following description, which can meet your DIY needs.Good accessories for Vehicle or remote control