This 4" x 1-1/4" Hard Rubber on Rigid Caster administers good floor protection and quiet movement. It is an economically amiable wheel that contributes prudent resistance to shock and vibration, and is recommended for environments that are free of water and/or floor debris. The Rubber tread is hardened into a heavy duty rubber core that offers high impact strength. This Caster helps prolong equipment life and protect cargo.