【Eco-Friendly & Extra Thick & Dirty-Resistant Grey】: Yrangee blocking mats for knitting & crochet projects are made of environmentally EVA material, which is non-toxic and odor free. The blocking mats are high-density and extra thick (0.75''), so they can effectively hold your pins firmly in place. These keep your crochet, lace, or needlepoint work taut and reused for many years. 【Fit for All Projects】: The size of individual knit blocking mats is 12*12'', you can assemble them 36*36'' or any shape you want according to your project. Our blocking mats for knitting feature a perfectly aligned grid that allows you to precisely work on your proj