This is a 7x17x5mm Ceramic RC Engine Bearing. Made specifically for high performance racing use in RC engines. If you are looking for a 7x17 mm ceramic bearing for non engine use please choose item C027.
This 7x17mm Ceramic Engine bearing can be used in any nitro engine application or in any condition requiring high heat and high RPM resistance. Sealed on one side and open on the other allowing optimal engine lubrication to reach the bearing. Price if for one 7x17mm bearing.
For 12x21x5mm Ceramic RC engine bearings choose ACER Racing item C062.