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When it absolutely, positively needs to be quiet-Master Caster® Noiseless Casters are the solution. Dual ring patented technology eliminates excessive noise. Specially designed stem provides quiet mobility on all floor surfaces. Eliminates black powder residue created by metal-to-metal friction. Extended life cycle on stem fastener. Perfect for hospitals, libraries, schools, and offices-anywhere quiet is necessary. HOW TO SELECT CASTERS: 1. Remove caster from leg of chair base. 2. Match the stem of the caster to diagram. Select the correct length and diameter. (Tops of stems can be flat or rounded-either will fit.) 3. Determine if caster is to be used on chair mats, hard floors, or carpeting. Choose soft wheel casters for use on chair mats, linoleum (vinyl), and hard floors; hard wheel casters for carpeting.