Compatible for Sennheiser Momentum, Momentum 2 True Wireless, CX-400BT and more Earphones. Suitable for caliber 3.5-6mm Earphones.【All Day Comfort】High quality soft foam can provide 24 hours comfort and stop the ear hurting pain caused by silicone tips. You can choose the perfect size which comply to your individual ear shape.【Slow Rebound Sponge】Memory foam is a polyurethane foam with slow rebound sponge. It will be ugly and deformed after pressing, usually it needs to wait 5-8 minutes to fully rebound. Don't worry.【Improved Sound Quality】This memory foam tips can offer a good seal to reduce some of the outside noise and allow you to focus on your audio. You can retain the best fit and get the best sound by using the ear tip fit test at first.TIP EXPERIENCE: The majority of customers replace tips once every 3 months, however your body chemistry (earwax, oils, sweat, etc.), usage, and environment can all impact the life of your tips; For maximum effectiveness, replace your tips when they start to flake, tear, or lose their memory foam properties (for example, the foam expands too fast)(Ear Tips Only, Air Pods Pro is not included!)