Lighted Caster Wheels For Wheelchairs available in 3″x1″, 4″x1″, 5″x1″, 5″x1 1/4″ and 6″x1 1/4″. Number of total lights: 4 bright LED lights per side in green, red, blue, and white (8 lights per wheel). Lights can be seen at 360 degree angles. Lights are powered by a self generating system – NO BATTERIES EVER NEED IT! Bearings: 5/16″ ID, ABEC 5 High Performance Bearings Pre-InstalledRim: ONE PIECE COMPOSITEHub Width: 1″ HUB.PRICE IS FOR ONE PAIR (2).Compatibility: Fits most manual wheelchairs!Quickie Manual WheelchairsColor’s WheelchairsTi-Lite (Only those chairs with 5/16″ axle. Please measure your axle to make sure they will fit)And many others!California Proposition 65 Warning⚠ WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov