Add 2 mm of depth to the rear of your case back.  The sponge of the EVA foam allows some cushion to the rear of the watch that allows a better fix from either a bracelet or a strap!  

Stop that pesky loose watch falling down onto your wrist!

The glue is 3M and does not ruin your watch.

1 disk (2mm) per package

These are produced in batches and are shipped in 1-2 weeks depending on availability.