A deformed after wearing it several times and became a little irregular, but it was not obvious when wearing it, so it doesn't matter. Put it on carefully. A can't be reshaped. A You can wear it for a long time if you don't knock hard. A is solid and reliable. A can't knock. Knock a and it will collapse. Don't break it. A goes bad easily. Dress carefully anyway. A it's really bad. Change it to a solid one later.