Upgrade from Bushings or Replace Worn Bearings with Bearings from Duratrax. FEATURES: Ball bearings reduce friction and last longer than bushings. Chrome steel construction. Sealed for protection against dirt and moisture Available in many popular sizes for most R/C applications. 90 Day Warranty INCLUDES: Two 5 x 8 bearings THICKNESS: 2.3mm(.091") COMMENTS: To clean bearings use DTXC2458 Power Shot Cleaner. ir/jl BOX DIMENSIONS: 1.88" W. X .50" H. X 4.00" L. BOX WEIGHT: .01 LBS.