Collapsible making it suitable for smaller cases Plastic frame with foam rubber padding Height adjustable Size: 1/2 The FOM Violin shoulder rest is an excellent entry level shoulder rest, ideal for beginner violinists who want comfort at a very affordable price.Often recommended by teachers, the FOM has a plastic formed classic shape, very like the KUN collapsible, with a firm foam support.The FOM is available in 3 sizes: 4/4-3/4 size, 1/2 size and 1/4th size. Brand FOM SKU FO608EL1JWIP0NAFAMZ-264911 Model ME045