Update 2: The seller sent a replacement and everything is fine. Update: The seller contacted me about my recall and offered to replace the defective item. Upgraded to 4 stars for good customer service. Will go up to 5 once I get replacement buttons and everything is resolved. I like the idea of this set but there seems to be poor quality control. One of my 5mm buttons wasn't milled deep enough and doesn't seat properly on the magnet, rendering those four buttons unusable for me.