Plastic Sheet that can be used as a bookmark and ruler. It also comes handy when writing while standing. The front side has a 10th anniversary limited design, and the back side has a grid which serves as rules to help writing on blank paper. Back: Grid of 5mm sections, serves as a 10cm-long scale, made of polypropylene H124 x W85 x D1mm MADE IN JAPAN No.40219006