About this item A revolution in sound performance, with foam that expands at the perfect rate. Enjoy crisp, clear sound and comfort for an all-day immersive experience. Memory foam is a degradable material; each pair should last up to 4 weeks. Designed specifically for earbuds with a speaker diameter of between 5.8 - 6.5mm. Available Sizes: Small, Medium, Large Eartip Dimensions: 0.43 x 0.43 x 0.39 inches.