These are Aerospace Grade 6AL4V Titanium M5x20 Titanium Screws with DIN 7991 Flat Hex Heads. 2 pc per pack.  

Super lightweight and made not from lower grade titaniums but from the best Grade 5 6AL4V Titanium. We also offer button head M5x20 Titanium Screws and a complete line of M3, M4, M5 and M6 Titanium screws in button head, flat head and various lengths.