Twenty official Nerf Ultra darts in a refill box; the packaging carries item code E6600. You recognise Ultra darts by the marbled shaft and the orange finned tip, and that is exactly what sets them apart from the plain blue Elite darts most people already have at home.
Check the compatibility, because this range differs from the rest. Nerf Ultra darts work in Nerf Ultra blasters only. They do not fit an Elite or Mega blaster, and the reverse is just as true. If there is an Ultra One, an Ultra AMP or another model from that range in the house, these are the darts that belong with it.
Darts disappear under the cupboard, into the hedge and behind the sofa, and a blaster without ammunition stays where it is. A refill of twenty is therefore more of a necessity than an extra - and a fine small gift to tuck in alongside a blaster. The box states from 8 years.