3 Sizes Stop Snoring Open Ring Anti Snore Stopper Acupressure Sleep Aid Product Information Principle of snoring: physical therapy, acupuncture at acupoint in traditional Chinese Medicine; The principle of acupoint pressing in traditional Chinese medicine through the human nervous system The ring uses the acupoint stimulation point, precisely positioned in the nerve point of the left thumb root. Sufficient constant pressure produces stimulation and connects the central nerve and vagus nerve through it. Connected to the respiratory system, thereby reducing and eliminating snoring symptoms. Specifications: Size: (The inner diameter of ring) S (1.5-1.7cm) M (1.7-1.9cm) L (1.9-2.2cm) Color: Silver Quantity: 1 pc Packing Included: 1 X Anti Snore Ring Note: 1. Due to the different monitor and lighting effect, the actual color of the item may be slightly different from the color shown on the pictures. 2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm) Thanks for your support :)