Matches are held within a wrestling ring, an elevated square canvas mat with posts on each corner. A cloth apron hangs over the edges of the ring. Three horizontal ropes or cables surround the ring, suspended with turnbuckles which are connected to the posts. For safety, the ropes are padded at the turnbuckles and cushioned mats surround the floor outside the ring. Guardrails or a similar barrier enclose this area from the audience. Wrestlers are generally expected to stay within the confines of the ring, though matches sometimes end up outside the ring, and even in the audience, to add excitement.