Thank you for viewing! ◆ Discounts are available for combined purchases with other items I have for sale. Please feel free to contact me with any questions. …………………… Mini-sized acrylic keychains You can put your favorite images or other items inside. I've kept these for many years, but there are no noticeable stains. I only opened the round one to take pictures. The square shape is 2.5 x 2.5 cm. Other sizes are about the same.