About this item Compatibility Compatible with Studio Buds and Fit Pro models. Slow Rebound Sponge Memory foam is a polyurethane foam with slow rebound sponge. It will deform after pressing, usually taking 1-5 minutes to fully rebound. Dont worry. Long Lasting Comfort High-quality soft foam provides 24-hour comfort and alleviates ear pain caused by silicone tips. Ensuring long-lasting comfort for your ears, great for running, cycling, working out at the gym, and much more. Does not hurt ears for prolonged wearing. Small Size Small size, fits in the charging case without the need to remove the ear tips when placing the earphones into the charging case. Ear tips only, earphones and charging case NOT included. Storage Box Equipped with a storage box for storing 6 pairs of ear tips (Medium Size), ear tips only, earphones and charging case NOT included. Dimensions: 2.3 x 1.8 x 0.5 inches.