Mini ball wheel 3PI N20 universal (OT3679)

This product consists of four small balls and one 12mm large steel ball, all steel balls are made of stainless steel to ensure that they will not rust after long-term use. The outer ring is made of plastic. Width: 22mm Height: 15mm Application: Small robots instead of caster wheel Dimensions Length: 2.2cm Width: 1.5cm Height: 1.5cm