Check the listing for details. Rubber Stoppers, Size 3, Solid, Karter Scientific 216N1 (Pack 33). Condition: New. Listed at 16.99 USD. Rubber Stoppers, Size 3, 1 Pound Bag (Case 33) Product Description: Size 3, Fits 22mm and 23mm Glass or Plastic Tubes. Excellent grade rubber. Do not use with food or drink! Low sulfur content, and has long lasting Numbers molded into the top. Product Features: Excellent grade rubber Do not use with food or drink Low sulfur content Long lasting numbers molded into top Shipping Policy: Our standard policy is to ship out all orders the same day if payment is received before 5:00 PM CST Return Policy: Returns Accepted After receiving the item, if you wish to return it please contact us within 14 Days When we receive your return item your refund will be your money back. The buyer is responsible for return shipping. We do not charge a restocking fee. If you have any questions, please email us