Features: 1) Flat tube for auto radiators 2) Alloy: 3003, 4343/3003 3) Specification:16 x 1.7 x 0.33, 16 x 1.8 x 0.33, 23.5 x 1.91 x 0.35, 14.5 x 1.73 x 0.33, 16 x 2 x 0.35, 25 x 1.5 x (0.3-0.4), 26 x 2 x (0.3-0.4) 4) Temper: H18