Acrylic Clapboard 9.6x11.7" /25x30cm Dry Erase Director Film Movie Clapper Board Slate - Black Large-size: 25 * 30cm / 9.6 * 11.7in. Acrylic material and non-wood produced, easy to be written or cleaned. Computer-engraved English letterings for longevity. Magnetic sticks ensure firm and audible closure. Special design and powerful enough to avoid crack.