The small double hull tender sized of 300cm,330cm,360cm and 380cm. we call Carp boat. Carp boats are made of 2.5mm thick powder coated marine grade aluminum for boat hull and 1100 Dtex pvc fabric or 1.0mm hypalon fabric for inflatable tube. Best rigid hull inflatable boat and affordable rib boat CB330 has double flat boat hull and single front locker.