Girls' cage - Guinea Pig Cages

I love the little fence up that nice and wide ramp.
What'd ya cover the ramp with?

i just got my cage and it looks like yours but i dont know what to use as a brace for the upper level or for the ramp can anyone help i love this cage it is very cool what did you use for the ramp

Thanks for the comments.The ramp is a plank and it's covered with a rippled card board called Corrugated card board.It was stapled into the plank.Now the piggies won't slip on the plank,thanks to the corrugated card board which gives their feet some traction.