Strong & Comfortable Material : Outer strong memory foam and Inner silicone tube.There is a buckle inside to hold tightly with earbuds. Break Strength is over 10 lbs. Rebound time is over 60 seconds which is much better than 90% market normal foam. Perfect match with earbuds . Fit in the charge case. Easy installment . No need extra tooling. Enhance Sound Quality : The memory foam tips noise isolation offers superior audio experience enhanced bass and good seal block out external noise. Packing List : 3pairs/pack with S.M.L size . One pair for each size. Packed by hard PP box to protect very well. Ultra strong and super comfortable memory foam eartips. Fit the charge case very well. 3 pairs with S/M/L size in the packing.