4 pieces of 300mm clear anodised MakerBeamXL. MakerBeamXL width and height = 15mmx15mm, available in different lengths.
We have drawings available (.STP, .DXF, .STL, .PDF). 

Makerbeams are available in different lengths. The beams are anodised in black or clear, have a hollow core and have threaded holes each end. You can find an overview of specifications of all our beams and more items on our blog tagged 'technical details'. Here is the link: technical details MakerBeam, MakerBeamXL and OpenBeam.

You can find drawings of more products here.