About this item The patented spinnable 3D axis flexes to match the unique angles of ear canals, providing a customized fit. This is an easy and affordable upgrade for earphones, dispersing sound to align with the ear canal's direction, thereby enhancing sound performance. Constructed from non-irritating silicone materials, certified by SGS after passing relevant safety tests. The Dual-Layer Tube Core and Triple-Segmented Core fit various nozzle shapes securely and comfortably. Compatible with popular models such as WF-C700N, InZone Buds, XM4, XM5, and more. Eartip Tube Core diameter: 3.7mm, designed to fit earbuds with nozzle diameters of 4.0-5.5 mm. Size: 3.07 x 2.8 x 0.55 inches.