This radius sanding block is made by Hosco in Japan. The radius sanding block is double sided. One side has a 12 inch radius as seen on most Gibson guitars and the other side has 10 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.