from the Manufacturer:
THE FRAME STRAP SYSTEM IS A MOVING EXPERIENCE guaranteed to make you smile! The freedom of full mobility, only a dream for the cellist or upright bassist, is now a reality. The Frame Strap System fits over the shoulder like a guitar strap, but holds the instrument out from the body in the ideal position for bow and pizzicato technique.
Lightweight frame design has triangulated body contact points to provide a high degree of stability and comfort.
Convenient height and angle adjustments allow players to accommodate personal styles of play. In addition to the vertical position, the neck can be angled horizontally like a guitar for picking and strumming.
A single wing nut secures the instrument in place for fast set-up and breakdown. The strap system fits both cello and double bass.
Virtually all traditional playing techniques are possible, including thumb position. The instrument neck is tilted back and close to the shoulder, but the body angles out, away from the body for excellent bow access across the full arc of play. This angle also helps traditional cello and bass pizzicato technique to sound and feel natural.