Durable and beautiful. The 30' Round Sunlight Standard Gauge Overlap Pool Liner has a beautiful blue design which looks like sunlight sparkling through the water. This durable overlap swimming pool liner will last and maintain its beautiful appearance for years. Strong double-welded seams will withstand winter's worst. This flat-bottom liner will fit either a 48"or 52" sidewall. Please read the instructions for your above ground pool to make sure you purchase the correct pool liner style. An Overlap Pool Liner is placed over the edge of the swimming pool wall. Plastic strips called "coping strips" are then used to secure the liner into place. The top rail of the pool is finally used to cover the coping strips. Sparkling blue design. Standard gauge.