Sun2Solar Above Ground Pool Coping - Flat Style (31 Piece) for pools up 18' round Flat Style (31 Piece) for pools up 18' round These plastic, non-corrosive coping strips act as a clip to hold your overlap liner in place on the pool wall before reinstalling the top rail Replacing old, worn out coping strips with new ones when replacing your pool liner helps ensure a firm, proper liner installation Flat style coping comes in 2' long pieces Designed for round and oval pools only.