These are Manchester Grinders own line of wheels supporting High quality Neoprene Rubber with a high shore hardness for good not over springy wheels, Spacers between the bearings to minimise bearing damage by accidental overtightning, High quality Aluminum CNC in England on state of the art machines. 
 
Features
 
CNC Machined for perfect dimensions, Balance & Concentricity.
Steel Spacers installed.
High quality Vulcanised & Ground Rubber.
Bearings are installed at point of sale. 
Commonly used on our, Ying Yang, Capstan, 2x48 & #2 platens
 
Note - Bearings are 12mm this will allow for a m10 12mm shoulder screw to be used. 
 
Grinder not including. Listing is for a single wheel.