New threadless style as of Summer 2019. These are new Genuine Innovations Presta Valve Adapters that converts a Presta valve into a Schrader valve. These have a black O-ring for a positive seal. They are now threadless (internal) and work on both threaded and non-threaded presta valve stems. For bike pumps, they can now stay attached to the bike pump and easily slip onto the presta valve when ready to pump air into the tire. Previous version of adapter only worked on threaded presta valve stems and could not stay attached to a bike pump. These are guaranteed to work with any presta style valve stem. These ship out First Class Mail with tracking, shipping time is 3 days or less. Let me know if you have any questions. Thanks for looking!