Description Good copper material enables the excellent performance of the pinion gear combo, superb craftsmanship, designed for long-lasting performance, this set of gear can totally meet the need of RC toy lovers. Features - Color: Golden. - Material: Copper. - Size:0.50 x 0.50 x 0.50cm/0.20 x 0.20 x 0.20 inch. - This is a most commonly used shaft gear. Lightweight, easy to carry and use. - The product is great tools for DIY car, robots, model making accessories. - The durable gear is suitable for DIY model production technology. - The product also suitable for DIY science and small production, product design, mechanical model. - With smooth and stable performance to improve control fun, providing smooth experience.Package listing: 20 x copper pinions