This 5" mega caster from R&B Wire is specifically designed for laundries and the proprietary, patented Thread Guard design has been rigorously tested and will outperform your expectations in minimizing lint and thread pick up! This polyurethane wheel creates less floor friction, meaning less material build-up on the wheel and the sealed bearing raceway minimizes dirt contamination.Model #: CSTR88G Patented Clean Wheel Systemâ„¢ Caster Creates Less Floor Friction And Less Material Build-Up On The Wheel Sealed Bearing Raceway Minimizes Dirt Contamination Dual Sealed Precision Bearing System Designed For Smooth Rolling And Years Of High Performance Fits Models 100E58 And 200F Carts 6057331