Description
Our high-quality rubber stoppers are soft, non-greasy and have a durometer of 45. They are sold in a case of ten one-pound packs.
These stoppers are size 12 and are drilled with one hole. Size 12 stoppers have top diameter of 64mm, a height of 25mm, and a bottom diameter of 54mm. Approximately 5 size 12 stoppers are included per one-pound pack.
PRODUCT WARNINGS
WARNING: This product can expose you to chemicals including benzene and lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
This product contains latex, which can cause allergic reactions in some people. If symptoms of an allergic reaction occur, stop use immediately and consult a physician.
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.
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
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Shop NowFrequently Asked Questions
Shipping
Yes! We offer fast, free shipping on eligible orders within the United States.
Most orders are processed within 1–2 business days. Delivery typically takes 3–7 business days, depending on your location.
At this time, we primarily ship within the United States. For international orders, please contact our support team for assistance.
Product
Yes. Our labware and science kits are specifically designed for educational use and are trusted by schools, teachers, and homeschooling families.
Most of our kits include easy-to-follow instructions or experiment guides. If you need additional help, our support team is happy to assist.
We carry a wide range of science education tools across multiple disciplines, including:
- Labware
- Electricity and Magnetism
- Force and Motion
- Light and Sound
- Properties of Matter
- Biology
- Chemistry
- Earth Science
- Novelty Items
Our products are designed with education and safety in mind. Adult supervision is recommended for younger users, especially during experiments.
Other
We’ve been supporting science education for over 60 years, providing reliable labware and hands-on learning tools.
We accept all major credit cards and secure payment options such as Shopify Payments, PayPal, and more.
Yes! We offer a satisfaction guarantee. If you’re not fully happy with your purchase, we make returns easy.
Our friendly support team is always ready to help. Reach out via our Contact Us page or email for expert assistance.