1. The ball is made of high quality carbon steel, and the shell is made of environmentally friendly ABS material, strong and durable, has good wear resistance and is not easy to wear. Small furniture casters - Maximum load: 100 kg. Casters can reduce friction between objects and the floor, roll flexibly, quickly, stably and energy-saving. 2. This furniture steering wheel is made of ABS plus 304 stainless steel, stable and very strong structure, not easy to fall, strong carrying capacity, strong and wear-resistant ball, simple and practical, smart and smooth, not easy to die for, reliable with a long lifespan. 3.Flat furniture casters suitable for a variety of applications and surfaces. 4.Suitable for installation in storage boxes, bedside tables, flower boxes, etc. 5. The furniture casters can be easily installed without drilling or tools, align the direction of the four wheels, just stick the mini furniture casters to the bottom of the box and let them sit for 24 hours.