Check the listing for details. RC Engine Ball Bearings - Dynamite Mach 427 w/Pullstart - “Truggy" .26 Mach 2. Condition: New. Listed at 16.99 USD. Performance Series RC Engine BearingsCompatibility:Dynamite Mach 427 w/PullstartDynamite “Truggy" .26 Mach 2 with Pull/Pin Start Includes:1 x Front (sealed) & 1 x Rear (open) engine bearings Specifications:Polyamide Plastic Retainer to Strengthen the cageABEC-3 Precision Grade or betterC3 Clearance Description:Included in this listing is a set of two Premium High Speed RC Engine ball bearings. Our Performance Series RC Engine bearings have tighter tolerance and manufactured specifically to withstand the heat and high RPMs in model nitro/gas engines. Bearings are also available in Ceramic for even greater performance and engine longevity. Please inquire if interested. A word of advise. Do not confuse these with run of the mill bearings sold by most other sellers at enticing prices. Those are typically low grade, with unknown specs, and more importantly, no Polyamide reinforced cage.