1. Tire: rubber 2. Wheel: aluminum alloy 3. Rubber groove surface with good grip, not easy to slip 4. Strong and wear-resistant material, long service life 5. Solid tires are not inflatable and do not fall off, no need to worry about being punctured, maintenance free 6. Easy to install, no special tools required 7. Inner diameter: 8mm 8. Size: about 148 x 40mm 9. Weight: about 650g
