so heres my tail, disembodied :P
the spine is made from a bike tyre that i cut to length then sealed the loose ends so i could then inflate it to give it shape and bounce.
the best part though, is unlike most other tails ive come across, this one is genuinely a skinny appendage with an assload of floofy fur covering it. the diameter of the tube itself is no more than my forearm, yet with a solid 5cm+ of fuzzy fur coming out of it, it grows to 20-25cm diameter