Non-slip bottom square coaster with a handy metal bottle opener on the side. Get some extra light while reading with this white LED light. easy to clip on to the book and has a flexible stem to adjust the light as per your requirements. 4cm W x 4cm HStandard: 1cm W x 2. 5cm H. Optional: On Clip: 0. 5cm W x 2cm H (1 Colour Only). Black, Blue or White. Red or Blue with White Trim. Gray with Black Trim.