We have about 100 feet of stiff black tubing available.
It has a thick wall. This is not what we use for irrigation dripper lines. I think someone bought it by mistake. It has never been used.
The OD is 17 mm, the ID is 12.5 mm, the wall thickness is 2.2 mm. (Approximately 5/8 inch OD, 3/8 ID, 3/32 wall).