It depends on where you have bought it. I bought mine at www.muenchenticket.de and it looks (difficult to say) on the left it is light blue, on the right it is pink. But it can look different if you bought it somewhere else. On my ticket stands "Arena unbestuhlt". If there is the word "Arena" or "Innenraum" somewhere on the ticket you have the right one.

MissUnderstood I was talking about the tickets for Germany.