You'll need some solid core single-strand wire. I recommend 8 gauge copper.
STRANDED WIRE WILL NOT WORK.
Single strand is best because it is stiff, pliable and can hold a shape.
You can probably use coated or uncoated wire.
I just happened to have uncoated left over in the garage.
You will also need some soft rubber hose.
Notice that you want a hose that is somewhat soft and flexible.
I found some while cleaning the garage today.
The hose I have appears to have an outside diameter of about 3/8 inch.
Looks like the hose wall is about 1/8 inch thick.
And finally the hole in the hose appears to have an interior diameter about 1/8 inch.
These are approximate measurements.
I believe this hose is a lawn mower fuel line hose that I got from Home Depot.
You will need some needle-nose pliers.
Also you will need some wire cutters.