Five Star Project X Copper Clay Kiln Fire: 2 Stage - Carbon Required Shrinkage: 11-15% Clay Revolution has reformulated their line of Five Star base metal clays, now rebranded as Project X. This line of clay includes a second phase firing of just one hour! Long Working Time- Enjoy ample time to work on your creations without the worry of your clay drying out. Carves and Sculpts Easily- Sculpt and carve intricate details with precision and ease, thanks to Project X's smooth and pliable texture. Retains Texture Beautifully- Capture every nuance of your designs. Leaves No Messy Residue- Say goodbye to messes and enjoy a clean and enjoyable creating experience. Standard Shrink Rate- Rely on a consistent shrinkage rate for predictable results, ensuring your finished pieces are true to your design. Project X Base Metals shrink approximately 11-15%. Click here for Project X Base Metals instructions