Acrylic Ergonomic Writing Slope, Fully Transparent, Extra Wide for Better Writing Posture, 20 Degree Angle, Anti Slip with Pen Holder - Educational & SEN Resource - by Playlearn (Blue) 20 Degree Angle, the Optimal Way to Write to Help with Good Posture Non slip grips to prevent sliding Extra wide 35cm - 13.5" width to fit an exercise book L: 33cm - 13" | W: 35cm - 13.5" | H: 12cm - 4.7"