We have selected this soft metal free leather for this season's eco concept project. The harmful metal contained chemical, chromium sulfate is usually used during the normal leather tanning process. Metal free leather is processed through a new green technology. This technology makes the leather have no migratory metals, so the leather becomes safe and biodegradable at the end of its lifespan. In addition to that, the technique called, "micro-knifing" is used to create eye-catching design element on the surface of the metal free leather.