Marimba Models come in pairs or as a set of 4 (Graduated). Pairs come standard in No. 1 red, No. 2 blue, No. 3 green, and No. 4 yellow. Graduated sets are made standard in off-white. Handles are 5/16" in diameter and come in a choice of solid North-American birch or select rattan cut to 16 inches in length. Yarns are European made wool and nylon blends, which offer both durability and minimal contact noise.