Small Watch Guard. Protects your watch crystal.
The ID of these guards are:
Small = 1.3"
Medium = 1.5"
Large = 1.7"
XL = 1.9"
They stretch about 20-25% larger than that. Take a string and run it around your watch bands and across the crystal to get an approximate size.
Various Colors: Black, Brown, Blue, Purple, Green, Red, Yellow