Outer Dia :8mm Flething length:3" Material:Fiberglass Arrows body Length: 30" Full Length:31.5" Spine: 500 Feather Material: Plastic Weight:42g The tips： can be replaceable （According to your choice）. Condition: New item package include:12 pcs User Notice ★Do not shoot against concrete wall or any hard substance. This may damage the arrows.★Use a proper bow. Shooting from a bow with draw weight over recommended value may damage both bow and arrow. Suitable for draw weight under 40 pounds recurve & compound bows（According to your choice）.★Always use an arrow rest. Or the bow may be damaged by any arrow.★ If the plastic vanes shape is distorted.You can put the vanes into 176℉-194℉ hot water for a few minutes,or straighten them by using an air dryerthey ,they can be recover the original shape.