All eggs have pre-drilled holes. You can use un-waxed dental floss as your string to easily remove them. If you are using them for kegel exercise, start with the large egg, then the medium egg. As your kegel muscles improve, you can change to the smallest egg, because it takes more "skill" to use the smallest egg, and will improve the muscles that make sexual activity more pleasurable. Insert the egg and squeeze the muscles, which you will feel as the egg move. This lifts the pelvic floor. Hold for a count of ten, and then relax for a count of ten. Do 10 sets, three times a day. The key to success is doing this exercise daily, regularly. When your pelvic muscle improves and you get the results you want, when you do the exercise daily, at least once a day. If your pelvic muscle is in good health and you have good muscle tone, to keep these muscles strong simply insert the eggs at least four times each week and wear them while you do your regular activities for 20 minutes. Sizes: 45mm*30mm 40mm*25mm 30mm*20mm