<b> Product Details</b><br> Material: Carbon<br> Length: 30"<br> Full Length:31.5" <br> Spine: 500<br> GPI: 13.0 grain<br> Shaft diameter: Outer 7.85mm Inner 6.2mm<br> Weight: About 35g each <br> Condition: New item <br> Features: aluminum seat convertible with a variety of inch thread arrow <br> Suitable for Compound bow 40-60pounds<br><br> <b> Package includes</b><br> 12 pieces of carbon arrows.<br> 6 Nock for free.<br>