Yarniss Blocking Mats for Knitting & Crochet Project, Extra Thick Knitting Blocking Mat with Grid Lines，Knitting Mats with T-Pins,Green Durable Blocking Mats – Premium-quality blocking mats for knitting and crochet projects. Each blocking mat is crafted with 0.6" thick, dense foam, ensuring a sturdy foundation. Precise Grid Line for Blocking -- Grid markings allow you to align the sides of your project and block squarely for professional finish.The knit blocking combs set was specifically designed for ideal fit with our foam puzzle blocking board for knitting set which has either an inches grid.