PVC heat-shrink capsule for the top of a wine bottle. Adds a great professional touch when matched with a label. Shrink with an electric Thermocapsuler, if you are a high volume producer. Alternatively you can use the Shrink Capsule Tool to hold the capsule in place while dunking it in boiling water. A heat gun may work, but many times acts too quickly or unevenly, causing the capsule to wrinkle or split.