BRIDGESTONE Bridgestone B1ST Driver Back Weight 18g Unused Gift. Based on the product name on the bag (photo 2), it appears to be from Select Plaza sold on Amazon (1280 yen). ⚠️This is not a genuine product. It is an aftermarket product. ⚠️Although it is unused, the packaging was easily opened. I wore white gloves, which I use when handling products, and measured it with a Tanita scale in 1g increments. The weight and bolt together weighed 18g (photo 3). Therefore, although it is unused, I have set it to "Like New". ⚠️Also, since I do not have a B1ST, I am not sure if it is truly compatible. However, I measured it with a digital caliper, so please check the size of your own before considering purchasing (photos 4-7). ※Shipped via Nekopos. (I have set a longer shipping time because I would like to ship Nekopos items together as much as possible. If you are in a hurry, please let me know and I will do my best to accommodate you.)