Rubber caster wheel with PP core, roller bearing. Rigid & swivel size: 75*25,100*30,125*37,160*40,200*50 Caster wheel 4031Rubber caster with PP core,roller bearingSize: 75x25mm 100x30mm 125x37mm 160x40mm 200x50mmPacking: certain pieces per carton rubber caster wheel with PP core