Fiberglass Pools, Gunite Pools and Liner pools come in all shapes and sizes and all of them require a coping stone piece to go around the entire perimeter along the the edge of the pool.
The coping piece is usually not more than 2 ft wide x 4" thick x 18" deep and any variation in-between. There are typically two types of pool coping the first being the cantilever which is actually poured in place as part of the pool decking.