Altra Arrows Titanium Outsert for Altra 204 Arrows 400 Spine Set of 12 Black. R.C.O.S.) which fits our Altra Arrows 204 Shafts. Machined out of Ti5 titanium for unmatched durability and performance with optimal fit options this addition to your A.R.C.O.S adds the extra resiliance and weight you want for your arrow setup. The insert secures into the arrow shaft at a depth of 0.875in while the titanium outsert then threads directly onto the insert and encapsulates the leading end of the arrow at 0.43in creating unmatched durability. Essential rubber O-rings come pre-installed on the insert within the A.R.C.O.S. as they aid in locking the outsert in place which reduces vibration and improves concentricity between the outsert to the insert for a more precise arrow set up and down range accuracy. Specifications for Altra Arrows Titanium Outsert for Altra 204 Arrows: Manufacturer: Altra Arrows Color: Black Fabric/Material: Titanium Features of Altra Arrows 204 Outsert Titanium: Machined from Ti5 titanium for unmatched durability Fits Altra Arrows 204 Shafts Secure insert depth: 0.875 inches Outsert encapsulates arrow end: 0.43 inches Pre-installed rubber O-rings reduce vibration and improve concentricity Comes in 12 pk QTY Available in four sizes: 250 300 350 & 400 spine 56gn Outsert Weight 75gn Total Weight (when used with 7075 aluminum insert) Accepts micro FMS insert weights Package Contents: Altra Arrows Titanium Outsert for Altra 204 Arrows Altra Arrows AA-SI-00018: Titanium Outsert for Altra 204 Arrows 400 Spine Set of 15 Black