Physical properties appearance: brown Cylinder tablet diameter:9.0-9.5mm length:5.0-7.0mm bulk density:1.35-1.45kg/L Chemical composition Fe2O3:>=75.0% Cr2O3>=7.0% C:1.5-3.0% S<=0.025% Quality is the life of enterprise. If you have any question,do not hesitate to contact me