Mason Jar Gumball Machine Puzzle. This DIY toy is fun, educational, and environmentally friendly. Take any regular mouth mason jar and turn it into a fun gumball machine. NO TOOLS or GLUE required. Just pop out the pieces and assemble. There is also a coin slot on the side so you can use it as a bank, a great savings educational aid. Perfect rainy day activity for kids or to give away as party favors! 100% Biodegradable - 100% Compostable - 100% Post-consumer - 100% Reusable NO TOOLS or GLUE needed Do-It-Yourself Fun Doubles as a coin bank Jar not included Made from recycled cardboard Biodegradable Includes instructions This product is designed to fit Regular Mouth mason jars – please check your jars to make sure they will fit. Your jar should measure 2-3/4 inches across the rim. This item will not fit with wide mouth mason jars, which measure 3 inches inside the top, or around 3-3/8 inches from thread to thread.