Features : For Nozzle Diameter from 4.5 - 5.5mm Spinfit Patented Cushion Design ISO10993 Medical-Grade Silicone High Transparency in Bore Colores Upgraded clarity, more details in the sound and finish and gives betterinformation about the instruments. Better performance while moving,the rhythm of the instruments can be easily caught Excellence in both supporting capability and comfort. Steady and wax-proof. No need to worry earbuds falling off Better Flexibility Much More Durable Better Support on the soundport Gives Better Music Quality Better Skin-friendly Umbrella Reduces Allergy Reaction