THE STRAP FITS AMBIT3 RUN, AMBIT3 SPORT, AMBIT2 S, AMBIT2 R This is the original strap for the Suunto Ambit3 Run Black, Suunto Ambit2 S Graphite, and Suunto Ambit2 R Black watches. You can change the strap yourself using a size 6 IP Torx Plus screwdriver. The soft silicone strap feels comfortable on your wrist and fits wrist sizes 13 to 23 cm (5 to 9 in) in circumference. REF SS019473000