Sold in pairs Pre-installed 608 bearings Growing list of colors available 64 mm Diameter Sooner or later, any well-ridden kick scooter will need new caster wheels Replace them with these colorful 64 mm caster wheels from Monster Scooter Parts 30 Day Warranty Description Sooner or later, any well-ridden kick scooter will need new caster wheels. Replace them with these colorful 64 mm caster wheels from Monster Scooter Parts. These also come with the 608ZZ or 608-2RS ABEC-5 bearings you need to ensure a safe smooth ride. This size caster wheel is used on the rear of the Yvolution Fliker lift. Specifications Wheel Size: 64 mm Bearings: 608ZZ or 608-2RS ABEC-5 or better