About this item Measure your earphones nozzle, this memory foam ear tips fit many earphones, fit 4.5mm-6.3mm Nozzle wireless and wired in-ear earphones. This memory foam is made from high-quality polyurethane foam, safe and non-toxic, specially designed for in-ear earphones. Softer and more comfortable than ordinary foam materials. Memory foam replacement tips feature slow rebound, closely conform to the ear canal, are anti-slip, and provide 24 hours of comfort, making them suitable for long wearing and exercise. After extensive testing and design, the memory foam tips offer a superior audio experience with enhanced bass and good seal to block out external noise. Includes 3 pairs of memory foam tips and a plastic storage box. Size: 4 x 3 x 0.4 inches.