This 12" x 3" Phenolic Rigid Caster offers high weight capacities, and easy roll ability on clean, debris-free floors. The 90 Shore D wheel is made from phenolic resin mixed with canvas and has an operating temperature range of -50° F to +250° F. While resistant to oil, grease, and solvents, phenolic wheels become sponges to liquids when they are chipped or damaged, so this wheel is not recommended for applications which function where water is present.