The standard kit includes everything you need to get started with some more advanced Squishy Circuits projects that use LEDs, buzzers, and insulating dough! Contents: 1 - Battery Holder. 1 - Piezoelectric Buzzer. 25 - LEDs (5 each or Red, Green, White, Yellow, Blue). 1 - 3.5oz Container of Insulating Dough. 3 - 3.5oz Containers of Conductive Dough (in Red, Green, and Blue).