From Saturday night, the group will be sitting proudly in their spinning chairs ahead of the blind auditions, which will see hopeful singers coming to perform to the panel who will be sitting with their back to the stage.
If they like what they here, they press their button, spinning themselves 180 degrees, in exactly 3.5 seconds.
The chairs way a whopping 120 kilos - that's around 26 average house cats, or 8 rather fat ones, we imagine - and took 12 people four weeks to build.
Let's hope they work first time...
The Voice starts at 7PM on BBC One on March 24.