Prosthetic breast. Fits approximately a C cup. Lining in back is loosening. That will be fine if used with a bra for prosthetic breasts. Can be used on either side. I am 12 years out from my diagnosis and cancer free. This is my last prosthetic and has been in storage. The others went very fast. I apologize, but I do not have any appropriate bras for this. You can use it in bathing suits that have pockets for padding. Good condition. Will serve you well especially if you don’t have insurance to get free ones. C1