This pair of elastic straps are OEM replacements for those found on the Shearwater Research Petrel and Perdix dive computers. One of these straps also works perfectly on their Teric and Tern series dive computers. Kit includes two straps with sewn-in slide release plastic buckles. Each strap is {.75 in | 1.9 cm} wide and is made of depth compensating marine grade elastic material for a comfortable fit throughout the dive with either wetsuit or drysuit exposure protection.