These lab-grade cork stoppers are size 0 and are made from natural cork material. Size 0 means that the stopper is roughly 1/2" tall, 3/8" in its top diameter, and 9/32" in its bottom diameter. Each stopper is made of high-quality, natural cork from Portugal. They are sold in a case of 1000 stoppers.
Follow this link to see our Cork Stopper Size Chart.
This product contains small parts, making it a choking hazard. Only use with adult supervision.
Our products are not toys. Use in a laboratory or educational setting only. Not for children 13 and under.