Chair base set with 5 Casters: The package includes a set of replacement chair bases, 5 chair wheels, installation package Universal size: The office chair base diameter is 28 inches, with standard center hole (2 inch), universal caster socket size (11 mm x 22 mm). Applicable to almost all gaming chairs and office chairs Durable nylon: The material of this gamer chair base is nylon, which is more durable and stable than metal. Durable nylon material provides a strong gaming recliner chair base. Perfect match: Perfect match with gaming chair, the same exact style swivel base. it is the perfect replacement for gaming chair base Service: If there is any problem with the chair base, we will solve it for you in time