Pretty much everything they make is either evil or leads to disaster.
We should all be thankful that Sauron was into metal work instead of pottery. Mount Doom would have made a wonderful kiln, I should know, I did a City&Guilds pottery course. (Don't know if I passed though...after we sent in all our work to be examened we never go a reply.)
Can you imagine it? The One Teracotta with Tastefull Brown Glaze to Rule them All!? :funnylaugh: