Based on feedback on the original Sigelei 213, the Sigelei Fuchai 213 now utilizes Celsius based TCR calculation. The Sigelei Fuchai 213 also now features an aluminum alloy construction for a smooth and comfortable grip. Other then these two changes, the Sigelei Fuchai 213 retains all of the original features of the Sigelei 213 at a budget friendly price.