Replacing the pool liner: If your pool liner is damaged or you need to reinstall the mat, replace it with a new one. Made of high-quality PE, these pool covers can be attached to the pool walls and protected. Ideal Dimensions: Our pool covers are 61 cm long and 2.4 cm wide, making them easy to occupy on the mat, which is ideal for pool owners. Installation Tips: Please choose the appropriate number according to the size of the pool, then open it manually and slide it onto the cover for smooth sliding without damage. Number of Combinations: We provide you with a set of 33, 38 or 45 covers, which is enough for your use. They are ideal for replacing your pool covers. Reasonable Quantity: We have prepared different combinations for you to adapt to different types of bottom pools. 38 pieces are suitable for 20ft round pools; 45 fits round pools (requires 43), 17.7 x 32.5 inch oval pools (requires 44), 16 x 32 inch oval pools (requires 42), 28 inch circular pools (requires 45); 33 fits