About this item SpinFit patented spinnable 3D axis that bends to fit unique ear canals' angle like customized. Easy and affordable upgrade for the earphones. Sound is dispersed to fit the ear canal's direction, enhancing the sound performance. Made of non-irritating silicone materials, certified by SGS after passing the OECD 439 Reconstructed Human Epidermis (RhE) test (Report No. PUG23800708). Dual-Layer Tube Core & Triple-Segmented Core grabs different shapes of nozzles perfectly and steadily with comfy. Compatible with: Sony WF-C700N/ InZone Buds (WF-G700N)/ XM4/ XM5, Beats Studio Buds+/ Solo Buds, Soundcore Liberty 5/ Life A3i, Technics AZ100, JBL Tour Pro 3, Nothing Ear (a), CMF Buds 2 Plus...and MORE. Eartip Tube Core diameter: 3.7mm, fits earbuds nozzle diameter 4.0-5.5 mm. Product dimensions: 3.03 x 2.83 x 0.47 inches.