Better materials. The 7150 premium aluminum alloy used in the A Series lacrosse shafts offers a solid strength-to-weight ratio without breaking the bank. Preference is everything. Every player needs something a little different out of their lacrosse shaft, and that’s why the A Series lacrosse shafts comes in multiple weight options. Find the balance of strength, weight, and price that’s right for you. 6 month warranty. A Series lacrosse shafts are protected by StringKing’s fast and easy to use warranty for 6 months from your purchase. If you ever have a problem, submit a claim and get your replacement in 2-3 days. The StringKing A Series defense lacrosse shafts deliver superior performance at an even better value. Find your perfect intersection of strength, weight, and price. - 350 grams - Most recommended for ages 11-14 - Defense - 380 grams - Most recommended for ages 15+ - Defense