Part of the perfect boomerang range the Indoor Booma is made from soft and safe "Memorang" foam to keep it's shape. Do you ever wonder if it's actually going to come back? With Duncan each Booma can be tuned to change the range and make sure it comes back. Throws safely indoors with a 15'-20' range. Tri-blade design that ensures a stable and accurate return flight every time. All Duncan Booma models can be "tuned" to adjust the flight range and characteristics. Incredibly easy to throw and catch; Instructions on the back of packaging!