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"Raxxess ER/ERK Casters (4-Pack) [CASTER-ER/ERK] - Casters &amp;amp; Wheelbases: Furniture Grade Nylon Casters for ER &amp;amp; ERK Racks - Set of 4"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.avshop.ca/cases-amp-racks/rack-accessories/casters-amp-wheelbases/raxxess-er-erk-casters-4-pack>