RR17 is a pack of 4 standing Triarii in chainmail, they have a different mix of helmets than RR15. The mail has shoulder guards and is worn over subarmalis. They come with long thrusting spear and scuta. We will swap the spear for a pila if you want to use these as stationary Principes. We see these being mixed in with the 5 previous packs. The ratio of mail would have increased with time.