Clean it and put it in freezer compartment; Need to be frozen for more than 2~3 hours; Take them out， put them into the drink and wait for 10 minutes， and then you can enjoy the cool drink; Clean it and put them back to the freezer compartment.GeneralColor Silver 8pcsMaterial 304 stainless steelQuantity 8PieceOther FeaturesOther Features Dimensions: 25 x 25 x 25mmDimensions & WeightDimensions 0.98 in x 0.98 in x 0.98 in (2.5 cm x 2.5 cm x 2.5 cm)Weight 9.59 oz (272 g)Packing List8 x Ice cubes