This covers the internal Installation of most passive mandolin pickups. The pickup is tested on the mandolin to find the sweet spot, then mounted internally. A 1/4" endpin jack is installed so that the only sign of the pickup is the end of the jack. This gives a clean look which is perfect for purists that need to plug in. The price is for labor only and does not include the cost of the pickup. Add $10 for a gold plated end pin cover.