Made of durable cast vinyl, this sticker ruler is waterproof, UV protected and scratch resistant. With its high-tack adhesive you can be sure it won't go anywhere once placed, and with Salty Bones' printing process it will hold up in either fresh or saltwater, endure dirt and grime, last through soapy washes and more. Works great on a boat or kayak, cooler, truck bed, or just about any smooth, flat surface. US Standard measurements.