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.
Cams of a compound bow are round to oval metal discs which are held in place to the limbs via a pin and they are where the string and cable(s) terminate. They are attached at the end of the limbs and transfer the power of the limbs to the string and arrow during the shot.