These arrows were matched to a Yuan 30# bow purchased also. After a few hundred shots, these arrows have held up very well, and are extremely accurate.
Arrow spine seems to be around 500. Weight is 405 grains, length is 36 3/4" total, safe draw length of 36". Shaft diameter is 7.14 mm or 9/32". Balance point is 4 1/4" forward of center. The non-removable field points are 7.94 mm. wide. The fletching's have a high quality, heavy thread whipping protecting them, instead of the usual heat shrink tubing. Overall, very high quality, long draw arrows, that don;t cost much extra to ship if purchasing with a bow. Thank You.