Rey Mysterio and Sin Cara

The Exciting Tandem is a working name for the team that might otherwise by referred to as Mysterio & Sin Cara.

Etymology
On the Sept 7 episode of Smackdown, Josh Matthews referred to the pair of luchadors as an "Exciting Tandem".

History
On the Oct 1 Raw, they defeated Primo & Epico in the Tag Team Tournament. This is when they debuted new ring gear. While Mysterio's mask still exposes his mouth and Sin Cara's does not, their masks were otherwise half and half of Mysterio's rounded mask and Sin Cara's pointy mask.