For boats 0 -18 with beams to 7 -3 and low windshields. Use three vents for proper ventilation. One roll covers 7-8 boats. 14 x150 - For runabouts 14 -19 with beams to 8 -0 and full width wind-shields. Use three vents for proper ventilation. One roll covers approximately 6 boats. 17 x270 - For pontoon boats with 8 -0 beams. Cuddy Cabins 17 -24 with full windshields and bow rails. Use four vents for proper ventilation. One roll covers approximately 8 boats. 20 x100 - For Express Cruisers 22 -26 with beams 8 -0 - 8 -6 . Use four vents for proper ventilation. One roll covers approximately three boats. 24 x 115 - For Express Cruisers with arches or small flybridges 25 -29 with beams up to 9 . Use six vents for proper ventilation. One roll covers approximately 3 boats. 32 x 65 - For boats 32 -36 with wide beams and flying bridges. Use six vents for proper ventilation. One roll covers 1 boat. 17x 120- For pontoon boats and Cuddy Cabin Cruisers 17- 24with. Size: 32 X 65 . Color: Blue. Weight: 77.8 Lbs.- SKU: DRSHK047