New magnetic clamping system! Patented contact pickup. Please use it for contrabass and wood bass pickups. With some ingenuity, it can be attached to almost any instrument. I purchased it over 10 years ago and used it several times. The rubber part of the pickup has deteriorated over time and is very sticky, and dirt adheres to it. If used as is, it will stain the instrument. I think it can be used if the deteriorated parts are carefully removed, but I have not confirmed the operation, so please understand that it is non-refundable and non-returnable.