The Easton Full Metal Jacket 300 Carbon and Aluminum Arrow Shaft Pack of 12 is a top-of-the-line product designed for serious bowhunters. Its unique combination of carbon core and aircraft-grade aluminum provides exceptional strength and durability. The smaller diameter of 5mm allows for deeper penetration, making it ideal for big game hunting. With its N-Fused Carbon Nanotube core, this arrow can withstand the rigors of the hunt. Easton's patented HIT insert system ensures superior broadhead alignment, giving hunters a significant advantage. Fast shipping ensures that you'll have these high-performance arrows in your hands quickly.Key Benefits and Features: Material: Aluminum/Carbon Grains Per Inch: 12 Insert Weight: 16 Grains Nock Type: X Nock Nock Weight: 9 Grains Outside Diameter: 5 Millimeter Overall Length: 32.5 Inches Quantity: 12 Spine: 300 Straightness: 0.002 Inches Weight Tolerance: 5 Grains