The Jack Mason 20mm tropic strap has additional custom features typically unseen in anywhere else. The each keeper has a locking mechanism molded into the form to make sure you never have to worry about the strap tip sticking out. The FKM material gives this rubbery strap a luxury feel that's not too flimsy or too stiff, and performs perfectly in the water. The Jack Mason tropic strap is equipped with quick release pins for tool less strap interchangeability.