Hebei Naimei Bearing Co., Ltd. produces types of plastic bearing rollers: 1). Material: Carbon Steel/ Chrome Steel Bearing + Plastic( POM/ NYLON) Injection; 2). Application: for Aluminium Door and Windows; Aluminium Hardware Accessories and other sliding applications; 3). Plastic Color: Various, as per Request; -- For any detailed inquiry of non-standard bearing rollers, pls contact us freely. We will make a response within 12 hours.