Our solid black gum rubber stoppers are an essential item for any science laboratory. Each stopper is designed with a raised figure on top for easy identification of the size, making it simple to find the right stopper for your needs. Our stoppers are durable and long-lasting, providing a secure seal for test tubes, flasks, and other laboratory glassware. If you require a different size or 1-or 2- hole stoppers, we offer those as well - simply give us a call and we will be happy to assist you. Invest in our high-quality rubber stoppers to ensure a dependable and secure seal for your scientific experiments and research.