These are just impossible to photograph as they are small and clear, but you know what they are. They are plastic pots (containers) specifically designed to hold one watch movement. The side hole is for the winder to go through and hold the movement steady in the pot. Two further soft material cut-out circles will help secure the movement even more. They come in 2 sizes and you can choose from bundles of 2, 5 or 10. Economy shipping is also included free of charge, with a small extra charge for trackable or express shipping, both available to choose at check-out.
Feel free to contact me for any questions you might have.