We found them through the GetYourGuide App, which included them collecting us from our AirBNB nearby in Sirkka.
The guides were extremely friendly and we were provided with warm clothes, helmets, gloves etc.. when we arrived. They then instructed us on how to operate the snowmobiles and all hand signals to watch out for on the tour.
We rode out as a group to their own Kotta in the woods, where we cooked sauasages on the fire and drank warm berry juice.
Unfortunately the night was extremely cloudy so we had no chance of catching the aurora, but the guides still made it an enjoyable experience, we tried some impromptu ice fishing and they shared lots of knowledge and stories.
We rode 2 to each snowmobile, with a chance to swap riders at the Kotta if required.