Introduction Digi Binder Extra is designed by Kisun with the accumulated know-how and innovative technology. Hotmelt gluing is very useful for back to back binding silver halide (photographic) paper or synthetic paper that sticks with water-based glue. Digi Binder Extra is the latest innovation to achieve high performance, superior lay-flat quality and variable size from max 20” x 17” to min. 7”x5” with spine thickness 50mm. You can be satisfied more than your expectation and Digi Binder Extra will link your photo book business to the success.