Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: what grade are these magnets? some say N48, N52 etc.
Document: Have found the Power Dots to be excellent for holding pictures, invitations, etc to refrigerator door or white board. Like the fact that they are small enough that you don't have to move around to read an invitation or business card yet strong enough to stay in place when door is opened and closed by a rambuctious child or an in hurry adult. Of course, it is easy to add a decorative covering if you want.
Super magnets! These are so tiny and so powerful!!!! I used these to glue on the bottom of my sons cars so they would stick to his door that we painted with magnetic paint and they worked like a charm!!! !
These are AMAZING magnets. There are the dots which are about the size of a pencil eraser and they are extremely powerful. Great for crafts or just to use on your office cabinet or frig! Love, love, love them. They would be wonderful for children's crafts for Christmas presents for parents, grandparents or any family member. You must try them!
&#8220;Extremely powerful&#8221; is no exaggeration. I&#8217;ve used these glued to a plastic bar (.5&#8221; x 1.125&#8221;) to hold promotional buttons through clothing so as not to damage shirts and blouses with pins. Where it once required 3 magnets per bar, with the Power Dots two are more than adequate, even through thick sweaters with the larger 3&#8221; diameter buttons.
I bought these neodymium power dots for small projects where I want a something that provides a firm grip but is still removable. I've started using the small power dots to replace some I use to place items on the refrigerator...notes, family pictures, business cards. Every other kind magnets I use wind up sliding down or just falling off when the door is closed. These tiny magnets are so versatile I'm planning to use them in places where I might have had to use a permanent kind of attachment.
Excellent for displaying flip chart pages in meetings.
Answer: These have a 1.6 lbs. pull force in ideal test conditions.  They are N42.  Know that the higher the N# the more fragile the magnet.  The magnetic strength per weight can increase but with that they increase in brittleness, they can break to pieces much easier.  N42 provide the magnetic strength with durability for the best design for craft magnet uses.