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What is Memory Foam? Memory foam is polyurethane with additional chemicals increasing its viscosity and density. It is often referred to as "viscoelastic" polyurethane foam, or low-resilience polyurethane foam (see LRPu). Higher-density memory foam softens in reaction to body heat, allowing it to mold to a warm body in a few minutes. Faster speed of recovery of a foam to its original shape after a weight is removed is sometimes claimed as an advantage by memory-foam mattress producers, who may talk of "newer generation" foams with "faster recovery. Specifications: 1.Materials: environmental memory foam 2.Internal Diameter:4.9mm (0.19 inches) 3.External Diameter: 13.5mm (0.53 inches) 4.Package Wight:2.5 ounces 5.Package Dimension:4.7*3 inches Compatibility: Compatible with most models in ear Earphones. For example: for Shure: SCL2 E2C SE102; for UE: SF3,5PRO, 5EB, SF4, SF5, TF10 etc. for Sennheiser: IE6, IE7, IE8, CX6, CX95, CX300, CX500 etc. for SONY: EX90, EX85, EX700, EX300, EX35, EX76, EX33, EX55, EX52 etc. for KOSS: KEB24, KEB79; for AKG: K324P, K321, K330, K340, K370 etc. for Technica: CK9, CK10, CKM50, CKM30, CKM70, CKM90, CK1, CK51, CK7, CK6, CK31, CK52 etc. Package List: 4 pairs plush earbud covers (mix colors) WARRANTY: Risk free for 3 months Limited Guarantee! You can enjoy refund or perfect replacement without any condition in 6 months since the purchase date. Please do contact KINDEN first once you have any questions.