This easy-to-use swatch gauge has four different sized squares: 1″, 2″, 3″, and 4″, measured on the inside of each square. Because we know you’re supposed to make a 4″ swatch, but sometimes you just can’t bring yourself to spend that much time swatching before you get on to your project! Made from PLA, this swatch ruler is lightweight, dimensionally stable, and waterproof. My kids (6yo and 1yo) have been playing with the prototype for several days and haven’t managed to break it yet. That being said, PLA can melt at temperatures over 50C (122F), so I don’t recommend ironing it or leaving it on your dashboard in the summertime.