A countertenor is a type of classical male singing voice whose vocal range is equivalent to that of the female contralto or mezzo-soprano voice types.
Types of Compound Bows. Compound bows are classified by the type of cam system they use (called the bow eccentric.) The most popular types of compound bows on the market are Single Cam (sometimes also called One Cam or Solocam), Hybrid Cam, Dual Cam and Binary Cam. Less common designs like Quad Cam and Hinged are a little harder to find.
Diamond Archery. Diamond compound bows are made by the BowTech Archery Company. The bows that are made under the Diamond label are the single cam line of bows providing a great deal of adjustability in the draw length as well as smooth timing and a nice fluid draw across all of the bows. They do this by means of the solocam that powers each bow.