Alphabet and Numbers Stamp Set, by Stamp a Cake, is composed of upper and lower case letters (additional vowels), numbers, and popular social media symbols. The upper case letters each measure 3/8" tall and each lower case letter measures 1/4" tall. Stamp a Cake allows you to transfer gorgeous designs to fondant cakes, cookies, and cupcakes using food grade silicone and edible ink. Each Stamp a Cake design stamp is designed to be used specifically for confectionery use and only with Stamp a Cake edible ink. Black, gold, silver and white are the current available colors that can be used. The white Stamp a Cake color is used as a base color and it can be colored the shade of your choice by mixing in small amounts of coloring gel to achieve the desired color.