metal and for shell of map compass, for tough, wear-resistant, rainproof and A nice replacement people who love outdoor activities like hiking, traveling,, backpacking Easy to use, just put the metal wheel on the map and roll it, the pointer would point to the scale Lightweight and portable, with a metal replacement for easy holding This rangefinder allows you to quickly calculate distance by measuring the distance between two points on the map, Manufacturer: LiRRvb