The Preston Bung Twin Kit from Preston Innovations allows the elastic to be tensioned perfectly by wrapping it around the holder. The bungs feature a ribbed base for ease of cutting, an elastic holder for optimum tension, and an easy-to-remove design that requires an extractor rod. Supplied in packs of two. - Ribbed base for ease of cutting - Elastic holder for optimum tension - Easy to remove design (Extractor rod required) - Supplied in packs of two