No more steel ring! The Snap 3 Pro uses an adhesive for application. This is easily removed with a thin object like a credit card and reapplied again and again. If your Snap 3 Pro stops sticking well, you can revive the adhesion by wiping it down with alcohol.
Snap 3 Pro is Apple MagSafe compatible, adhesive assisted. It's more difficult to remove than typical MagSafe accessories because you can use other MagSafe accessories on top of it and we don't want it coming off! The magnets inside your iPhone just aren't strong enough to keep Snap 3 on your phone if you stick it to a fridge or car mount.