This is the XS Scuba Folding Wrist Slate Forearm Mounted Scuba Diving Wrist Slate Features: Designed to fit the curve of a forearm Three separate writing surfaces with two fold up leafs Carbon stick pencil Dimensions 4.25 wide x 4.0" tall (10.8 x 10.2 cm) Two methods for attachment included: Velcro strap and bungee cords The XS Scuba Folding Wrist Slate is a curved three part writing slate made to fit to your arm for a natural writing surface that&';s always available. Five writing pages are available by the hinged wings so you have plenty of space to write messages underwater."