The 6' Rhino heavy duty fiberglass folding ruler has waterproof fiberglass construction which prevents common problems that occur with wood rulers such as fading, splintering, and chipping. It outlasts wood rulers four-to-one. Engraved graduations resist weather and scratches. Easy-to-fold locking joints are tighter than traditional folding rulers made of wood. This allows more accurate measurement along the length of the ruler. Rhino ruler - 10ths & inches,