The smaller lengths are for juniors and the larger lengths are for adults.

The riser is usually made from aluminium alloy for strength. The limbs are fitted with an eccentric wheel. (The axle is off-set from the centre of the wheel.)

The bowstring is attached to 'tear-drops' at the ends of the plastic-coated steel cables, with the cables fitted from top to bottom wheels. The cable guard holds the cables off to one side for the arrow and fletch clearance.

The draw weight of a compound bow is usually adjustable within a 7 kilogram (15 lbs.) range by turning the adjustment bolts in the limbs.

The compound bow has a peak draw weight and a let-off percentage. For example, the peak draw weight for a particular bow could be 14kgs. (30lbs) with a let-off of 50%. This means that the maximum draw weight of 14kgs. will occur at approx. 3/4 of the draw length and as the eccentric wheels roll over, the lever effect will give a 50% less weight at full draw. So at full draw, the archer will be holding a draw weight of only 7 kg's. (15lbs.)