This is an extension hook that attaches to your existing bra. It can be adjusted to three levels and is easy to attach with the included hooks. I purchased it from Cecile but never used it, and it has been stored at home. The outer packaging has torn, so I will repackage it for shipping. Hook width: Approximately 5.5 cm Adjustable sizes: 1st level: Adds approximately 2.5 cm 2nd level: Adds approximately 3.9 cm 3rd level: Adds approximately 5.3 cm - Colors: White - Colors: Black - Material: Polyester Thank you for looking.