It is composed entirely of polyurethane tread. This caster is an excellent upgrade over regular polyurethane. 

A 100% mechanical link to the core is guaranteed, and there is "zero" trapped air because of the use of a novel liquid cast flow fusion design. 

It is highly resistant to dirt and the majority of chemicals. Also, Polyolefin makes up the wheel center with green tread color.

Compared to regular polyurethanes, the exclusive tread offers exceptional floor preservation and has a longer life span. 

Features

• 100% Pneumatic bond to the core
• The non-marking, premium tread
• It withstands the majority of solvents, oils, grease, and water
• Superior ball bearings with accuracy