This is an all rubber (solid rubber) Rib Design Dart mat of superior quality. It is heavy duty (7-10 kgs) and is suitably marked for distance using a vulcanized rubber process. The white line markings are molded into the mat and not screen printed after molding this means they do not rub off so easily as is the case with screen printed line markings. The mat is a few inches longer than required so it can be cut accurately according to your own setting. To clean, simply use a damp cloth and wipe clean. This is a good, solid, simple, trouble free product