caster wheel for humidifier, 1. nylon material, 2. dia 30/40/50mm, 3. with and wthout brake, 4. with M8*18mm metal pin caster wheel for air cooler,A. black, white, grey,silver or other colors are available.B. loading 15/25/30KGS per piece;C. Has SGS certificate;D. used for movable furniture.E. packing:4pcs/polybag,200pcs/ctn. JKQ50 caster wheel for humidifier