Thank you for viewing! The parts are firmly secured, so they should be fine for everyday use, but there is a risk of damage if excessive force is applied. Also, since these are handmade, the enclosed parts and their arrangement will vary. I made these hair ties for children using resin as a hobby. They are items that have been well-received as gifts for family and friends. These hair ties are for children from around 4 years old to junior high school age. Please note that they are small for adults with thick hair. Size: Hair tie diameter: 4cm