Viva VLML5 Standard Large 4/4-3/4 Violin Shoulder Rest, Black Innovative, patented lateral adjustment system ensures proper fit for all shoulder widths for comfort and to encourage proper playing posture Ergonomically designed BASF composite frame provides complete and comfortable support without tipping, with locked end members to prevent over-extension Stepped and grooved rubber padded feet provide an incredibly secure grip with minimal sound dampening contact Patented locking device to limit rotation Collapsible feet for easy storage