These bottles are perfect for refilling wine and sake for the second-stage exams of the Sommelier Exam, Wine Expert Exam, and Sake Diploma. This set includes 12 bottles, each with a capacity of 100ml. These bottles are slightly slimmer and taller than the small bottles used by schools like Vinoterras Wine School, so they don't take up as much width in the refrigerator (though they do take up height). The bottom diameter is about 4.3mm. The height is 13cm. The bottles have been sterilized by boiling. The caps are made of aluminum, and please check the photos for the small dents that may occur when the seal is broken. The color of the caps is a slightly gold-tinged silver, a color between silver and gold. Please also check the photos for the slight dents on some of the caps. There is no problem with use. We hope that those who understand that these are used items will purchase them. Thank you very much.