These stoppers are designed for use with the Tulip Interchangeable CarryC, CarryC Long, and CarryT items. Thise stoppers can be easily attached to the end of the CarryC/CarrryT/CarrryC Long cord. This stopper can be used alongside CarryT Interchangeable Bamboo Tunisian Crochet Hooks for single hook crochet projects. It is also useful for making temporary bindings when you take a break from knitting.