These are fantastic curtain rings.  They truly are heavy and well made.  I have purchased both the silver and black for different window hardware.  I am using them on thick, heavy velvet drapes and so far they are holding up well.  The drapes glide effortlessly across the rod. It brings a classy look to each room.  The only negative is I wish the clip itself was a little larger.  I'm using them with thick drapes and they barely hold the ends where the fabric is doubled over. However, they are staying on so far.  Also, when buying realize these are larger than the average curtain rings and will make your drapes hang lower from the rod.  So measure from floor carefully.  I will be buying more of these for every room.