The Artino SR-10 Shoulder Rest is fully adjustable for a personal fit on 1/2-4/4 size violins and 14"-17" size violas. The durable foam padding on the SR-10 is very thick and extremely comfortable. The rest is constructed of aluminum so it is extremely durable. The rubber feet grip your instrument without slipping. Along with being fully adjustable, it can completely collapse to fit in almost any violin or viola case.