M-Beam 650 I-Beam
From Kerbal Space Program Wiki
Description Manufactured by Dinkelstein Kerman's Construction Emporium, this is a wide, upscaled version of the M-Beam 200 I-Beam. Dinkelstein loves variety, man.
Specifications
Total Mass: 0.08 Drag: 0.2 Maximum Temp: 3200 Impact Tolerance: 80