Please try it once!! Your glasses really won't slip down!! At first, even though they're not slipping, you'll fix your glasses out of habit (lol) Prevents annoying glasses slippage! Glasses stopper. Also for reading glasses! Just insert them! Anti-slip stopper to prevent glasses from slipping Soft silicone material! Highly flexible and resistant to deformation! Fits your ears and doesn't slip easily. Great for various situations! Product size: Approximately 55mm x Approximately 7mm Weight: 1.6g (per piece) Quantity: 2 sets of gray (2 pairs, 4 pieces total)