Great except that few backs will fit.
I was very pleased with these at first, but BE FORWARNED: the post is much thinner than usual, as a result CLUTCH-04, EWC-20 and STG-CLUTCH earring BACKS DO NOT FIT. Artbeads says that the EWC-20 do fit but I tried several new ones I have in stock and they slide right off just like the others. ARTBEADS recommends STG-NUT-LT, so we will see. Too bad, because the post is strong even though thin, and you can use chatons in these, giving you many more colors than are available in CZ. The snap-in works well and the prongs are OK.