NERF stands for Non-Expanding Recreational Foam a tough material suitable for outdoor play yet soft enough to be easy to catch &, we hope, to bounce off the greenhouse without any damage! The Nerf Vortex is a US football shape with a large tailfin that allows it to spiral flawlessly through the air & travel for great distances. Whilst in flight, three separate whistles in the body produce an eerie scream. Finger grip zones help even novice throwers to achieve spectacular flights. It's also lightweight so it's easy to pack & carry to the park, beach or camp site. Complete with finger grip zones, the Nerf Vortex Pocket Howler spins & fly faster combined with its howling sound creating the perfect gift safe for children 5 years & above! It makes the simple game of throw & catch more interesting with sight & sound & is also great for throwing around the office!