Ball bearings Forum › Get Help › Components This topic has 1 reply, 2 voices, and was last updated 6 years, 8 months ago by Angel LM. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts March 29, 2017 at 3:51 pm #607 Jamie Williams Hello For the art4 bearing ring, what size are the plastic ball bearings to use in it and would buying metal ball bearings be better than the plastic ones. Many thanks March 29, 2017 at 10:04 pm #1227 Angel LMAdmin Hi Jamie, I have used airsoft pellets for that bearing. Them are made of plastic and have 6mm of diameter. I have not tried with metal balls, but this ones work perfectly and are too cheap. Hope it helps! Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.