This is a cable tailpiece for a contrabass. It's a cable tailpiece from Marvin USA, for 4 strings. It makes the sound easier to produce and improves resonance. I've used it for about six months. As shown in the photos, I will send the tailpiece, the cable ties used for installation, and the instruction manual. The Velcro pieces are not included. (You can still use it without them; it looks better without them.) Originally, this item is imported privately and retails for 14,000 yen. Keywords: Wood bass, double bass, contrabass, double bass