Title: Isn't strong enough to do what it is advertised to do
Review: I should have listened to all of the other reviewers. The magnets are not strong enough to hold these to a register. Your only hope is if the vent is on the floor and the air flow is blocked off some other way first. Even when the vent is closed, the small amount of air coming past is still enough to lift these off of the register..After discovering this, I thought that I would use these for another purpose. I cut them into strips and made magnetic labels for some metal shelving at work. However, the same problem persisted. They would only stick to the shelf as long as no one walked past them and brushed them with their sleeve.I don't think there is any possible use for these. Sorry.
Is this product review negative?