The double hull yachts sized from 520cm to 680cm, we call big patrol boat. Big patrol boats are made of 4mm thick powder coated marine grade aluminum for boat hull and they have built in fuel tank. Patrol boat has 1100 Dtex pvc fabric or 1.0mm hypalon fabric for inflatable tube. Quicksilver inflatable boats for sale and hard dinghy tender PA520 is one kind of yacht tender.