Newstripe's NewLiner HD 50 lb. 4 Wheel Dry Line Marker is the most durable heavy-duty dry line field marker available. These are the original, American made NewLiner HD infield chalkers. They are ideal for marking baseball infields, running tracks, cross country courses and any special event. NewLiner HD Dry Liner models are made with durable construction to provide years of dependable service.The NewLiner HD Dry Liner was designed for those who want the best, most durable field chalkers available.