9-Pack Interlocking Blocking Mats with 50 T-Pins, each measuring 12" x 12" with precise 1" aligned grid, ideal for knitting, crochet, granny square, needlepoint and all yarn crafting projects, providing ample space for both small accessories and large blankets, shawls and home decor. Premium high-density foam material is water-resistant, heat-resistant and steam-resistant, maintaining its shape without warping during wet blocking or steam blocking; thick and durable construction prevents pins from piercing through, ensuring safe and long-lasting use for frequent crafters. Freely interlocking design allows flexible combination into various siz