The elk’s antlers are actually bone. The bone which antlers are comprised of is the fastest growing bone, it can grow up to 1 inch in a day. They start out as layers of cartilage the slowly hardens into bone. Before they become bone they are light and rather delicate so they are covered with a soft material called velvet. Around August the blood stops flowing through the antlers and they harden. The elk will then rub or scrape the velvet off on usually on trees or even the ground.
By the time a bull elk is 2 years old he will have slim straight antlers with no branching, they are called spikes and are between 10 and 20 inches long. By the time they are three they will begin developing tines that come off from the main spike. When the elk is seven years old the antlers may have six tines each and could weigh as much as 40 pounds, they could be more then four feet across from one to the other.