Recommended for those with metal allergies! Made of glass, with an O-ring. Handmade, so the shape is slightly irregular, but it's a new, unused item♪ Color: Maple Size: Post thickness 1.2mm x length 8.0mm (excluding ball), ball 4.2mm Caution: Since it is made of glass, it may break if strong force is applied. ⚠️Regarding bulk purchases, we will discount 50 yen from the second item per delivery. Items sold as a set are counted as one item. Also, for separate deliveries, the discount will be calculated based on the number of items in each delivery. We apologize for the inconvenience, and thank you for your understanding. Shipping is usually handled on weekdays. Comments may be delayed, but we try to respond within 24 hours, so please be patient. m(_ _)m ☆Please feel free to contact us for pair orders, size changes, bulk purchases, etc.