Material of 2 inch Stem Casters is Polyurethane and Metal. Premium quality and very sturdy configuration.   

These castors with brakes hardly bring noise to your comfortable life, and won't scratch any hard wooden floor. Made of the popular non-marking polyurethane rubber type, swivel caster stems are very quiet running, absorbs shock and vibrations. It really helps move casters without inducing vibration, rattling, squeaking, and other hazards and annoyances. 

These castors are used in the bottom of wall mounted cabinet. Or another products or equipment. And make wall mounted cabinet can be moved conveniently.