Measurement - Size XS : 2.5mm Tube, 15mm Inner Diameter | Size S: 2.5mm Tube, 25mm Inner Diameter | Size M: 2.5mm Tube, 35mm Inner Diameter | Size L: 2.5mm Tube, 45mm Inner Diameter; Manufacturer's 1-year limited warranty; Rhodium plating may require special care.; Made in Italy