Chloe McClaren and Manasui Narula compete in a schools archery competition in Auckland in 2005. In 2013 the popularity of the sport was growing, and an archery-in-schools programme, including inter-school competitions, was being run. The students use modern recurve bows, named for the reverse curve at the tips of the limbs. The limbs are made of layers of fibreglass, carbon, wood or syntactic foam, and the riser (rigid central section joining the limbs) of wood, carbon, aluminium alloy or magnesium alloy. The risers can be seen in this photograph, but the reverse curve cannot. Recurve bows are the only ones allowed in Olympic competition, but in 2013 they were no longer the most commonly used in New Zealand. Compound bows – which use a pulley system to increase the draw-and-release power of a bow – were developed in the early 1960s, and have become the most commonly used bow.