(Ship from USA) Cork Backing with adhesive for ceramic tile coasters *JPOU842H5ET12521 25 pieces Natural cork backing with peel and stick adhesive. They work great if you are making your own tile coasters. Really provides a nice finished product that protects table tops and other surfaces from scratching. Rounded corners help prevent lift off. Measures 3.875" x 3.875" x 1mm...fits 4" and 4.25" tiles perfectly. They can be easily trimmed with scissors to any size/shape you need. Use these cork backs if you are decorating tiles using any of method...painting, dye sublimation, fired on decals, etc.