Dinkleboo Tween labels are printed on vinyl and will adhere to most surfaces. Labels are dishwasher safe, however, when using a dishwasher labelled items should be placed on the top shelf and the dishwasher should not be set on "high temperature" settings. We do not recommend placing labels on items that are used in microwave ovens or bottle sterilisers. Each label measures 4.8 x 2.2 cm (1 7/8" x 7/8")