Function meets form in this hefty combo. The ballast block keeps your sail sign stable while the skirt lets you add full-color artwork. Compatible with scissor and cross bases (sold separately) when used on flat, hard surfaces. Ballast block is constructed of high-grade nylon polymer. Ballast block holds 4.75 gallons of water (weighs 40 lbs. when filled with water). A molded handle makes it easy to move. Skirt is made of 400 denier polyester. Sail sign sold separately.