An air splint is a dual-walled, tube-shaped device used to temporarily immobilize a long bone. Which of the following statements about air splints is false?

a. They may help control bleeding by applying constant, external pressure to a wound.
b. They are most often used to immobilize injuries located distal to the elbow or the knee.
c. They are inexpensive and easier to clean than other types of splints.
d. They are made of a tough fibrous material that is difficult to puncture.

Answer: d