I use Barry Mitchell's Can O Wands on every birthday show. They are much more reliable than the plastic covered snakes. They appear to be covered with a silk or thin nylon fabric. Once in a great while, they do get stuck coming out. If this happens, I just make a funny face, peer inside the can, and poke around in it with my finger. Usually, they will then explode right in my face, which is even funnier to the children.
I also use Derek Rutt's giant snake wand on every birthday show (30 foot snake). It has never misfired yet, though one time a young guest at a party snuck up behind me and fired the trigger while the wand was still inside my table. Needless to say, it exploded all over the place, knocking props over and making a mess. Before I could comment or even make it back over to the table, the child's mom swooped in, scooped her up, and smacked her soundly on the rump. That child behaved very well for the remainder of the show !
I love spring snakes....
ROBBiE the RiNGMASTER'S
CiRCUS of MAGiC!