Rabbit Bottleneck Gifts (Bottle Toppers, Assorted Colors, Set of 2) These bottle toppers are designed to fit all bottle sizes, and seal opened bottles to maintain freshness. Constructed of rubber and tough stainless steel, these bottle toppers are made to last. Useful for sealing any kind of liquid: cooking oil, vinegar, salad dressing and more. The toppers attach to bottles, preventing them from becoming separated. A loop attached to the packaging allows this set to be hung from the neck of a wine bottle, making an excellent gift.