Features: - Made of good quality plastic, wearable and long service life. - These products are for toys gear pulley and other spare parts, suitable for DIY model technology production. - There are11pcs for your option including many kinds of gear parts and you can find one that better meet your need. - Small parts, easy to use, great model making accessories for all kinds of cars, robots, etc. - They are also good replacement of old or broken parts.