75pcs Mixed Plastic Gearbox Rack Pulley Belt Worm Gear Single & Double-Gear 8-56 Teeth DIY Tool for Robot Repair & Toy Car DIY Kit Push to Connect Air Fitting Enhance your balance and core

Enhance your balance and core strength with NNEOBA's 75CM Yoga Massage Ball

enough to meet your daily use and replacement needs

thus also reducing noise and better protecting the floor

and appearance is very stylish and beautiful

75pcs Mixed Plastic Gearbox Rack Pulley Belt Worm Gear Single & Double-Gear 8-56 Teeth DIY Tool for Robot Repair & Toy Car DIY Kit Push to Connect Air Fitting Enhance your balance and coreSpecification: 75pcs of gear can match each other, all combined into gears, these gears are suitable for shaft Containing worm, straight teeth, shaft gear, the tooth crown, the double reduction gear DIY science and small production, product design, mechanical model 75pcs set lists: 9 kind of Spindle gear 11 kind of Crown gear 12 kind of Single gear 19 kind of Double gear 7 kind of Belt pulley 2 kind of Worm gear 5 kind of Belt 2 PCS Connect rack 6 PCS