4mm Black Zirconia Ceramic Ring Core Blanks Channel Inlay Bulk 5-Pack

4mm Black Ceramic Ring Core Blank Channel Inlay Bulk 5-Pack This is a package of five (5) beautiful black ceramic ring blanks. They are highly polished with beveled outside edges. The Zirconia ceramic material is tough and durable with hypoallergenic properties. A custom-made 1.4mm center channel groove is perfect for adding your inlay material, such as crushed opal. Perfect to create your own unique ring creations! Material: Zirconia Ceramic Width: 4mm width Channel: 4mm wide x 1.2mm deep US standard whole and half size ring blanks are available Note: Measurements are close/approximate.