Product review (4 stars): They Work Fine & The black Color Compliments the Stainless Range
I contacted their customer service department when I received it, advising them that I ordered "& Paid for Two." They were courteous and apologetic but it's been a couple of weeks and I'm still waiting. The Cap itself is functional, It has magnets to keep it in place.

Update 20 Aug 2013. Finally received the 2nd one a month later (Stock Problem is what they said).
Overall they work great.