"Rigid 4 x 1-1/2 caster, mold on urethane"
Swivel 4 caster with 4 x 1 1/2 Moldon Urethane wheel
Swivel 3 caster with 3 x 7/8 Envirothane wheel
Rigid 6 caster with 6 x 2 RollX (RT) wheel
Swivel 3 caster with Envirothane wheel with SLB
