Made of , thick and sturdy. With practical design, they are , wear resistant and shockproof. This kind of caster wheels are mostly used for chairs, furniture parts and for certain equipment. for transporting light furniture and industry use. Features - Color: Assorted Color. - Material: Plastic and steel. - Size: About 5.00X2.40X2.00cm/1.97X0.94X0.79in. - These small caster not only be applied to shoes box, trash bin, small container for smooth, easier moving, but also a perfect DIY accessories, good for kids toy, works etc. - Made of steel and plastic material, ensure and more better using performance. - Adopts precision production to the stable characteristics and high reliability. - Come with 8 pieces for you to install, make your life convenient, hope you enjoy the fun of DIY. - This handy roller ball bearing is just what you need for constructing movable surfaces in the home, garage or professional shop. Package list: 8 caster