Standard size flexible pond liner, 0.56 mm HDPE, suitable to create a pond 7ft x 4ft x 18 inch deep, 300 gallons. Actual Liner size 12ft x 9ft, manufactured from durable 0.56mm HDPE, providing excellent strength and flexibility to shape around curves and contours while standing up to everyday ground conditions. Designed to be water-safe, durable watertight barrier. Compatible with Blagdon Aquagarden Pond Liner Seaming Tape (sold separately).