ProLine Composites Thin Wall Tubing

[wfcook]

38mm 1.520 ID and 1.600 OD Weight 2.6oz / FT

I'm just curious why the ID of these tubes is larger than the ID of other available tubes (LOC, BlueTube, Magnaframe, PML, etc). The CTI nose cones seem to have been made to fit this larger ID as well.