I use a brass tube style with a flat filed of at the end with a bastard file a piece of hobby store styrene for the tongue. I was shown this method by E.J. Jones works great…
Not everyone is thrilled with the sound of styrene. Some use a slip of cane (arundo donax) for the tongue on a brass barrel. Benedict Kohler recommends using sugar pine from old piano keys. This is what I am currently using, i.e. sugar pine on a brass barrel.
djm
I use brass/plastic drone reeds from D. Boisvert.
In the D’s: Elder, brass and sugar maple
In the B’s: Cane.
Patio.
“Old fashioned” cane reeds in tenor and baritone drone. The bass drone is equiped with a cane-body-brass-tongue reed. Works fine for me! 
I’ve currently a cane bass reed, and brass/plastic for the baritone and tenor. The baritone is a bit forward (leaning toward rude). All three have been quite stable, but I’m considering giving a go at a brass/cane, or brass/pine composite. Can anyone give me an idea on dimensions/thicknesses for a set in D?
Thanks,
dave boling
Dave, copy the internal dimensions of your existing drones (as near as you can get, given that brass tubing is available in only so many sizes). Dave Quinn gives measurements for brass barrelled drone reeds in his “Piper’s Despair” book.
djm
Currently using natural cane. I’ve tried brass tubing with styrene tounges and it was fine. Also, brass tounges worked well for me and… to my suprise a tounge made from 1/16" thick balsa worked. It was on the quiet side.
Same. Quite nice, they are.
Yes, they provide a really nice ‘Buzz’ IMHO.
Better than…ahem…hemp. 
Yeah, and legal too.
Tenor: wood dowel/plastic tongue
Baritone: cane/plastic tongue
Bass: cane/bronze tongue. Foot of the cane has a small copper ring in it to support the cane…which has split. Works though!
t
Tenor D - Currently trying a natural UTAH “cane” like tube (small grass with feathery top that grows in swampy areas). Usually have styrene/brass
Baritone D, Baritone A/G, Bass G - Styrene/brass
Bass D - Currently trying same as the tenor
Spanish fly…er, cane…
Brass with plastic tongues made by Malcolm McLaren - pipemaker, not SexPistol
DG
… dang.
I’m using all wooden dowel type reeds, with cane tongues tied on. Tim Britton makes these, and I quote from his web site:
made by machining the body out of wood and strapping a carved tongue of cane or other material onto it much like a clarinet or saxophone mouthpiece. These I call wooden dowel reeds. They are much more expensive, tend to be clearer toned and more stable through weather changes and more controllable in their manufacture.
A bit of an indulgence, given the cost, but I like them very much; just the right volume to complement the Britton chanter, balance very well, and take just the smallest adjustments to keep them in tune and playing easily year round.
JVF