This rigid Pemco 4"x2" Thermo-Rubber (TPR) wheel plate caster is ideal for applications where floor protection, quiet mobility, and/or vibration mitigation is desired (if vibration and equipment protection are top of your list, make sure to check out Xtra-Soft casters). Our USA-made Thermo-Rubber wheels are non-marking, smooth rolling with standard roller bearings, and resistant to most chemicals and oils–an overall versatile and economical wheel (for greater durability, step up to Thermo-Urethane). This popular line is competitively priced and features: 1/4" thick steel construction, 4"x4.5" top plate, welded legs for strength, grease zerk in axle, RoHS compliant zinc plating for corrosion resistance, and a one-year warranty–this SKU is also NSF listed.