These drums are usually in sets of 4 (quads) or 5 (quints). The sizes of the drums are generally sized as 8, 10, 12 & 13 or 14 inches for quads and 6, 8, 10, 12, & 13 for quints. Mallets can be made of wood, nylon, felt, etc. Percussion arrangers will use brush or blastix effects or even mount a cowbell on the rim. Matched grip is used for flow between the drums.