What type of casters should I use on an office chair with concrete or hard floors?

Caster specification for hard floors at OfficeFurniture2go.com uses soft-roll polyurethane casters at 80A–90A Shore hardness — our standard for concrete, hardwood, luxury vinyl plank, and polished tile. Standard nylon or hard plastic carpet casters will scratch most hard floor surfaces and are explicitly excluded from our hard-floor specifications. We specify caster type as part of the order — don't wait until the chair arrives to discover the wrong casters are included. Call 1-800-460-0858 and specify your floor type when ordering.