Would they be flexable and strong enough for semicircular hoops for use outdoors?

Good product for electrical work but no it would just kink. The only way to get it into a semicircle would be to join at least 3 together. Blue pvc water pipe is what i would recommend.

What is the inside diameter?

Inside diameter is 16mm as near as l can tell.

What gauge are they? Are they rigid?

they are flexible due to the length before cutting. The small they are cut then they are quite sturdy. I have used them to make covers for my vegetable garden, about four foot long, they have a slight give in them if pushed down. I am so pleased with them that I will be purchasing more. very versatile for a number of uses.

Manufacturer	Generic
Part Number	PR20HW
Item Weight	14 kg
Manufacturer reference	PR20HW
Colour	White
Material	Polyvinyl Chloride (PVC)
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	14 kg

PVC Round Conduit 20mm x 3m White (30 Pack)

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