Alvin Ship Curve, Set of 6 (SC66A) Set of 6 ship curves fabricated from clear acrylic with smooth edges. Sizes include 6 3/4 inches (114), 12 1/2 inches (60), 13 inches (50), 15 1/2 inches (59), 24 inches (42), 24 inches (43).(Pattern number in parenthesis). Plastic thickness is 0.08 inches.