Set the boundaries for practice and game time. The Alumagoal Heavy Duty Dry Line Marker is among the most durable line markers on the market. The all structural steel, with 11 gauge frame and 18 month warranty make it a must have! There's an 18 gallon galvanized steel bucket, steel axle bushings and 4 pneumatic tires that measure 3.5"W x 10" in diameter.