HIGH QUALITY: The Magic Bullet is designed to handle hard to chop foods, but after long periods of use the base gear motor can wear out. This product is designed to fit Magic Bullet blenders. Made of plastic, rubber and metal. 4 spare gears: 4 spare gears, 2 base gears and 2 blade gears for your magic bullet. Reverse Threaded: All Magic Bullet base gears are reverse threaded. Magic Bullet Blenders: This is a generic product designed to fit Magic Bullet blenders. Tools required: Tools required for replacement: screwdriver or spanner, thick cloth, a little oil for lubrication. Features: Condition: New. Color: black and transparent. Materials: plastic, rubber and metal. Diameter: about 3~3.2cm. Height: about 1 cm. Weight: about 34g. For Magic Bullet 250W Juicer. Contents: 2 base gears. 2 rubber gears. Note: 1. Since the measurement is taken by hand, the sizes shown may vary by 1-2 cm. Thank you for your understanding. 2. Depending on the brightness and light settings of the monitors, the color of the actual item may be slightly different from the pictures. Please take the actual product as a reference.