This is an accessory for the main unit. I am selling it because I only use a straight neck. I ordered and purchased the main unit, so it is completely unused, including for testing. It has not been taken out of the bag except for inspection by the staff at the store where I purchased it. * I received it in the bag as requested. Especially for lacquer models, but of course, it is also recommended for those who use other finishes. Please consider it.