Easton 6mm Brass RPS Insert DOZEaston 6mm Brass RPS Insert Adjustable Weight for Precision Arrow Tuning Fine tuning your arrow's Front of Center (FOC) balance is one of the most effective ways to improve downrange accuracy and arrow stability and it starts with the right insert. The Easton 6mm Brass Break Off Insert gives you adjustable weight in a durable brass package, letting you dial in your FOC precisely without swapping out your entire arrow setup. Sold in a dozen bag, these