"Easton Deep Six XD arrow shafts combine the convenience of a stainless steel RPS insert with the technical superiority of the proven Deep Six system in a powerful, all-carbon bowhunting shaft. Deeper penetration, micro X diameter, greater energy retention, a naturally higher FOC balance, and more thread engagement make Deep Six XD more deadly, more accurate, and stronger. The all new for 2015, Easton Archery Deep Six HD arrows feature a straightness factor of =/- .003" With the Micro X at only 5.5mm, you get deeper penetration, dramatically reduced wind drift and a whopping 24% more KE Density! Deep Six RPS steel inserts are included and the X Nocks are pre-installed. Deep Six Steel Points are sold separately.