These are made of wool, and are used to improve the fit of your face mask.
They go at the back of your head and the buttons are to hold the straps.
Colours supplied at random, size of button may vary as well.
The sizes were measured from button hole to button hole.
Large are approx. 8cm or slightly more
Medium are over approx. 6.5 cm
Small are approx. 6 cm or less
Please note: remember wool does stretch.