ALGOOD HOODED TYPE SERIES CHAIR CASTER WITH SOFT RUBBER WHEEL - STEM TYPE B 2-9/16"" HIGH SOFT RUBBER CASTER WHEEL. HOW TO ORDER 1. MATCH YOUR CASTER STEM TO DRAWING. STEM DESIGN MAY VARY SLIGHTLY DEPENDING ON MANUFACTURER. 2. MEASURE WHEEL DIAMETER. 3. SELECT WHEEL COMPOSITION BASED UPON FLOOR SURFACE USE SOFT RUBBER FOR HARD FLOORS CHAIR MATS TILE AND WOOD FLOORS. USE HARD RUBBER AND PLASTIC (NYLON) FOR CARPETED FLOORS AND SOFT SURFACES. 4. ORDER COMPLETE SET TO INSURE PROPER MOBILITY. WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65warnings.ca.gov - 1,3-Butadiene