Handmade pickup for a double bass. As shown in photo 2, it's the type that is inserted into the gap on the side of the bridge. It has a natural low-end sound and I feel it has a good balance even when used alone. It's about 5mm thick, so you may need to modify the bridge feet to widen the insertion space. It will be fixed to the tailpiece using either a cable tie or an arc-shaped clip. It's new, only tested for operation, and has a handmade feel.