Wood the growth of the young timber in open stands after the old trees have been removed is more rapid than in trees in a closed forest, and in the manufacture of articles where strength is an important consideration such "second-growth" hardwood material is preferred. This is particularly the case in the choice of hickory for handles and spokes. Here not only strength, but toughness and resilience are important. The results of a series of tests on hickory by the U.S. Forest Service show that: The effect of rate of growth on the qualities of chestnut wood is summarized by the
Lacrosse stick "shafts," are made of hollow metal. They are usually octagonal, instead of round, in order to provide a better grip. Most are made of aluminum, titanium, scandium, or alloys, but some shafts are still made from other materials, including wood, plastic, or fiberglass. The open end of the hollow shaft must be covered with tape or a plug (commonly referred to as the "butt" or "butt end" of the stick), usually made of rubber. The head of the stick is usually attached to the shaft with a screw to keep it in place. Stick length is governed by NCAA regulations,