Specifications: 1) Size range: (6.35 - 114.3)mm (OD) x (0.89 - 13.49)mm (WT) 2) Heat treatment: annealed, bright annealed, stress relieved, normalized, spheroid annealed, or cold finished 3) Light wall, heavy wall, thin size, special cutting, tight ID tolerance, small hardness range, special mechanical property, special surface