It could be an actual cake lifter. A google search for cake lifter showed a large syle one being sold in the UK. Also Wilton has one that works pretty well. There are many other shapes and sizes on the market as well.
It's just an edgeless cookie sheet... they're the best for lifting large layers!
Awesome, thanks for everyones help. We have an airbake cookie sheet like that one but a little thicker so I will have to look the next time I am out.
I use a cookie sheet also, but how do you keep the cake from sticking to it??????