Petz Crack clamp set violin/… Petz Crack clamp violin/viola, set - 5 parts, without rubber Item No. ZN21VN Petz Crack clamp violin/viola, … Petz Crack clamp violin/viola, set - 5 parts, without rubber (width 235mm, 210mm, 195mm, 175mm, 135mm) × Petz Crack clamp violin/viola, set - 5 parts, without rubber