SIZE EST CAP DIAMETER 22mm (15mm - 22mm) 28mm (26mm - 28mm) 43mm (40mm - 43mm) 58mm (55mm - 58mm) 63mm (60mm - 63mm) 70mm (67mm - 70mm) 82mm (80mm - 82mm) for cap with diameter as shown above . please choose the same size (diameter for the cap) or bigger. if choose smaller, CANNOT fit in. if choose bigger, just fold the excess and blow as usual. Heat shrink film, used with a heat gun (or a hair dryer with a power of more than 2000W) for cap with diameter as shown below. *Please check you cap size to avoid buying wrong Have 2 color for choice: Black or White Can chat with our customer service to make sure what size of sealer suitable for your bottle cap. Please take note that no refund/return on reason size choose wrongly.