These buttons are made from the same materials the regular Art Stone Buttons. However, these have really been made fancy, so they are called Art Stone Plus. Some are multiple pieces, some have domes on top, and some are done with resin, or other materials. Some of these buttons are shown with 'High Domes" and some are shown with "Low Domes". The high domes are 3/8" high and have a slight magnification, while the low domes are basically the height of the button base. You will need to select the dome you want. These domes are acrylic, so we recommend that the buttons be removed before washing, so the domes don't scratch.