It's made of 3/4" EMT (a.k.a. "thin-wall
conduit"), The stuff has a very good strength/cost ratio, is long
lasting and is easy to work with. Basically, make a teepee out of
three pieces:
EMT is 10' long, so single lengths make
a teepee only ~8' high- good for beans but too short for hops so, use EMT
couplers to make 20' legs. Don't use the setscrews provided with
the couplers- instead, remove them, put coupler on EMT pieces and drill
completely through both the coupler and EMT pieces via the holes for the
setscrews mark the pieces for later assembly with 6-32 machine screw/nuts.
You can lash it together at the top like bean poles, but I perfer bolting: Squash (a hammer or big vise works well) 1-2" or so of one end of each piece of EMT. Drill a 5/16" hole in the ends and bolt together a bit loosely with a 1/4" bolt/nut/fender & lock washers. Pull out the free ends to make a teepee (get two other folks to help) so the bolted/flatten ends bend then lash on the 1x2 horz. members. Lash wood 1"x2" horz. members just above the bottom ends of the legs. Tip the teepee down and tighten the bolts at the apex. and tie one end of ~21' lenghts of sisal baling twine to the apex. Connect the other lenghts of legs using the connectors and screws/nuts. Tip up carefully and put something under the ends of the lefs so they don't sink into the dirt (concrete pavers work well). Drive ~3' lenghts of #3 (3/8") rebar into the dirt at an angle to and adjacent to the legs of the teepee so the upper ends of the rebar are adjacent to the legs of the teepee then lash to them to the rebar. This prevents wind from toppling the thing or damaging the base of the bines when it gets covered with hop vines. Run some sisal twine around the base of the teepee securing it to each leg. Tie the lenghts of sisal twine that now drop from the apex to that around the base to provide something the hop vines can readily climb up. To harvest hops cut them at base then unlash EMT from rebar anchors and tilt the teepee over.
BTW, using a wood dowel inside the EMT to join two piece is stronger than a coupler but requires whittling and I'd advise against it if you want to disjoint them for storage at the end of the growing season- the wood will swell when it gets wet...
BTW2: Sisal twine is perferred for the hops to run on since it's compostible with the spent hop bines.