Noise canceling earphones tips include18 pairs of silicone ear tips .These memory foam earbuds have three sizes, large size is about 0.51 inch/ 13 mm, medium size is about 0.47 inch/ 12 mm, small size is about 0.43 inch/ 11 mm, various sizes can meet the needs of your family and friends Premium Earphones Tips: Our replacement earbud tips are made of premium silicone material, soft and elastic to the touch, form a close environment with the ear canal to block outside noise, and enjoy the wonderful world of music. You will not feel uncomfortable if wear it for a long time. Soft and Comfortable to use: Thanks to the professional production technology, our silicone earbud tips have great stretchability, filling space, and keeping shape. These earphone replacement buds also have the best air permeability, which can effectively block outside noise and improve bass sound quality. High quality Replacement earbuds: Made of Premium Quality comfortable Ultra Soft Touch Silicone that effectively reduces and blocks the noise coming from outside for optimal sound quality. Water-washable, antistatic, removable and replaceable Easy to use: In order to provide you with maximum comfort and convenience, our replacement earphone tips ​designed for different ear structures, they have S, M, and L sizes, suitable for headphones with an internal size of 4.5mm-6mm(suitable for almost all headphones), help you hold well in place even when you play sports