Callicrate Smart Bands are used with the Callicrate Smart Bander. Extra-strong Callicrate loops are produced using a special latex formula that is over three times stronger than pre-made latex rings. Patented no-slip clip holds the tension for immediate and total blocking of the blood vessels, for faster scrotal drop with less pain and swelling. Because each loop is ratcheted to the precise tightness required, each use provides a custom fit. 25 bands per pack. Instructions included.