This radius sanding block is made by Hosco in Japan. The radius sanding block is double sided. One side has a 15 inch radius as and the other side has a 20 inch radius.

The radius block is made of alder and measures 80x150mm. The sanding part is 65 x 150mm.

Sandpaper is easily attached using double stick tape and can be cut to fit the sanding block using and a sharp knife blade.