Posture Perfect Solutions EVC3501 Caster

Posture Perfect Solutions Evolution Chair Ball Chair Premium Casters - Polyolefin, Polyurethane - Clear - 4 / Set; Add some pizzazz to your Evolution Ball Chair (sold separately) with these premium casters. Nonmarking wheel is mechanically bonded to a polyolefin core to prevent separation over time. Precision ball bearings rotate smoothly for excellent rollability. Long-life tread keeps your floors protected from scratches and streaks. Clear casters are designed for use on all floor surfaces.;