This is the bottleneck! Unlike metal objects, it has a soft and warm sound. However, since it is glass, it will break if dropped on a hard surface. Please be careful! As this is a handmade item, please refrain from bidding if you are sensitive. Please judge from the photos. We have never received any complaints so far. Shipping is included via standard mail. Bundling is not possible as it is prone to breakage. If you wish to purchase multiple items, please contact us in advance via the question section. Shipping will be via Kuroneko Yamato cash on delivery. Shipping is via standard mail. Bundling is not possible. No discounts are available.