The Guide Rollers have sealed bearings, zinc plated brackets, and are made of UHMW plastic. Our guide rollers help reduce friction and assist in a smoother operating gate and track. These rollers come in either black or white and are available in 3″, 6″ and 12″ sizes. 3″ Eagle Zinc Plated Plastic Guide Rollers starting at $13.00. 6″ for $15.50 and 12″ for $25.50.