Product Description: Mainly for large capacity plastic bottles: Bottle caliber (outer diameter 1.4 inches (36 mm), 1.1 inches (28 mm), Japanese plastic bottles (cocktail conk, 0.5 gal (1.8 L), 0.8 gal (2.7 L), 4 L), 5 L). *Depending on the shape of the bottle opening. Product specifications are subject to change. Specifications: Maximum Diameter: 2.2 inches (5.5 cm) / Height when worn: 4.0 inches (10 cm) / Polypropylene, Low Density Polyethylene, Silicone