12x20x4' ft Rectangular Beaded Mystri Above Ground Swimming Pool Liner-25 Gauge A triple helix of blue, and gold twists atop a field of wavy water in the Mystri Gold pool liner print. The Standard Bead is designed to slip into a standard liner bead receiver's track, which rests on the top of your pool wall. Bead receiver is required to use a Standard Beaded liner. This replacement pool liner has been built to the exact specifications to fit your Fanta-Sea rectangular pool. Size: 12' x 20'. Wall Height: 4' Flat Bottom. Shape: Rectangular. Connection: Standard Bead. Gauge: 25. **FITS ONLY FANTA-SEA RECTANGULAR SWIMMING POOLS**