we are in the north of china, dealing with steel products.

For carbon tubes, we can supply:

1.ERW    Round Tube
SPES : OD ??16 -??60     THICKNESS : 0.45-2.0 MM  
2.  ERW   Square Tube
SPES : 15.8x15.8x 0.6mm -60x60x2.0mm
3. ERW  Elliptic Tube
SPES :  12x22x0.45mm -32x52x1.8mm
4.  ERW  Oval Tube
SPES: 15x30x0.8mm -25x50x1.5mm
5. ERW   Rectangular Tube
SPES: 10x20x0.5mm -25x60x1.8mm
6. Galvanized Tube
SPES: OD ??16 -??60     THICKNESS : 0.45-2.0 MM  

We can also make to your requrements

Any more detailed information, please contact me  directly