Specifically designed for use with Excalibur Micro Series crossbows. They are 16.5 inches long and feature 2-inch offset vanes. Outside Diameter.347”, Inside Diameter .3015”, Weigh 9.9 GPI, Total arrow weight 163.4gr. Brand Name Excalibur Bullet Features Specifically designed for Micro Series crossbows; 16.5 inches in length; 2-inch vanes; Pack Size 6 Primary Color Black Item UPC/EAN Number 626192221667 Grains Per Inch 9.9 Fletching Length 2 Fletching Type Mfg. Stock Vane Length 16.5 Length Unit Of Measure in. Nock Type Flat