can't read?
Boron carbide (chemical formula approximately B4C) is an extremely hard boron–carbon ceramic, and covalent material.
B 7074 (OTTO) Boron carbide, pellets, diam. x thickness 18 mm x 6 mm, 99.5% Cas 12069-32-8 - used in tank armor, bulletproof vests, engine sabotage powders, as well as numerous industrial applications.