The Pearstone SADC-911 is a production slate made of white acrylic and designed to be used with dry erase markers. A cost-effective production tool that"s especially useful in sync sound productions--whether video, film, or dual-system DSLR--the slate comes with standard-size color clapper sticks and has a writing surface of 7 x 11". Writing Surface: Dry Erase Dimensions (WxH): Overall: 9.25 x 11" (23.5 x 27.9 cm), Writing Surface: 7 x 11" (17.8 x 27.9 cm) Clapper: Color