These are a new item for me, they were made exactly to my dimensions and are bought directly from the manufacturer I do not buy these in from Asia or anywhere else or any other distributor as I have seen their  quality is all over the place.

They work only on the Tascam BR-20

I also have a complete roller with a new major brand bearing

Also the new Brass ones are now available 

Brand new , correct sizes for double speed machines.