Therafin’s Theraslide Transfer Boards offer a smooth transition from wheelchair to chair. They are made from a 12-ply birch base with 1 additional ply laminated on top; 5/8" thick in the center section tapered to 7/16" at each end; finished with a walnut stain and three clear seal coats. See the details tab for additional features of the board. Stress tested to hold up to 650 pounds.