This is the XS Scuba SINGLE Fin Strap & Buckles for Propel Fins Features: Fits XS Scuba Propel Fin circular insert (male) buckle tab has a diameter of about 26mm Finger tab on strap for easier grip Complete assembly with male buckles & strap Easy adjustable quick-release buckles One complete strap assembly, NOT a pair SIZE: 13 inches COLOR: Black Spare fin strap assembly for the propel fin