[Specification 2] ●Assembly type ●2 fixed casters and 2 flexible casters ●Casters and decks that meet environmental standards of 40 dB ●Replacement casters: RP-CO(S)-130 (silent) (flexible), RP-CW ( S)-130 (quiet) (fixed) ●Net type ●Resin ●Wire mesh type ●Silent caster specifications