Zorks are a simple, reliable, leak-free way to "cork" your wine. They do not require a corker - you can seal the bottles by hand. You may want to use a rubber mallet to tap the closure into the bottle once started. To open the bottle, tear off the spiral strip and remove the tasting cork closure. No corkscrew required. No cork taint or broken corks. Preserves your wine for 4-5 years. Serves as a tasting cork once the seal is removed. Note: Zorks will not work with screw cap or Champagne wine bottles. Made of a low density polyethylene (LDPE) and is FDA and EU food contact approved. Zorks can be used on compatible bottles for water, spirits, mead, olive oil and other non-carbonated beverages. Dimensions Length = 34.8 mm (1.37?) Diameter = 32.5 mm (1.28") Weight = 8 grams (0.28 oz.) Zorks are 100% recyclable.