DuaFire Acrylic Plastic TV Movie Video Film Clapper Board Director Clapboard (Black) Material: Organic(Acrylic), easy to be written, cleaned and lightweight Record film production, director, scene, take, roll and date Built-in magnetic stripe, professional and resonant while being clapped and audible closure Clap-strip, special design and powerful enough to avoid crack A cost-effective production tool that's especially useful in sync sound productions--whether video, film, or dual-system DSLR