Designed specifically for the Cocoknits Maker's Board, these rulers stick to any metal surface. With the ruler, you can measure gauge swatches and dimensions of projects as you knit. With the gauge ruler, you can check that you're using the right needles for your project. As well, both rulers have a nice straight edge for you to visually underline sections of patterns, cross out lines of knitting charts, or hide lines of patterns so you can easily keep track of where you are.
PLA is biodegradable, but it is not water soluble, so these rulers can still get wet.