Made of extra rigid 4mm tempered Masonite® with cutout handle, smooth edges and firm spring clips. Rubber band is included with each to hold paper securely in place.

Sizes 15 1/2" x 16 1/2" & 18 1/2" x 19 1/2" have 1 clamp.

Sizes 23 1/2" x 26" and 28" x 38" have 2 clamps.