The balls fasten tightly and although they are a millimeter or two bigger than a typical size they still look cute. i have them in my nipple piercings because my body hasn't been too fond of metal and so far they are comfortable and actually kinda cute! they are externally threaded, which if you aren't used to, can be a bit uncomfortable to put in. but no sharper than a regular externally threaded metal barbell. ive bought from ruifan multiple times and its always quick delivery and great packaging.