Made of acrylic, it is waterproof, durable and built to withstand everyday use The built-in level in the marker shows your level and incline to aid reading Golf markers just lay flat on the putting green and make adjustments more convenient and accurate This golf marker will teach you how to adjust it. It is especially useful when you think it is flat, but if you have a little bit of Golf ball markers are lightweight enough to carry in your pocket during play, yet strong enough for quick reading, Manufacturer: Uitndvyte