Mar 4, 2019 · This item: HDPE Plastic Sheet (5 Sheets) 12" x 24" x 1/4" - Black Marine Board - ProTech Plastic $54.99 ($11.00/Item) 5 Pack 12 x 12 x.125 Black HDPE Sheets, Great for DIY Projects for Home and Marine Applications, Black Plastic Sheets, High Density Polyethylene Sheets, Made in USA $29.99 ($6.00/Item)