MS Range Keepnet Econ CP (round) Strong price-performance ratio with strong equipment. CP stands for “carp-proof” and so the net material is made of carp-proof PVC/PE. The net is fast drying and absorbs almost no water. The first ring is made of aluminum and the rest of a very strong plastic. Available in 350 and 400 cm, each in round (50 cm) and square (40 x 50 cm).