D'Addario PW-HDS Headstand Neck Support for Guitar String Changes:
The D'Addario Headstand provides secure support to guitars and basses for hassle free string changes and instrument maintenance. The compact design folds up for easy storage and the soft, over molded contact points will not damage instrument finishes. The compact size and collapsibility allow you to store The Headstand in your case, so it's there whenever you need it. Product Dimensions (folded): 5.25" x 1.18". Product Dimensions (standing): 5" x 4.25". Not intended for use with Banjos and Mandolins