This set of blocking mats from Milward, comprises of 9 interlocking foam boards which are simple to put together and stay firmly in place. They can be put together in various configurations and shapes for both large and small projects. Each board has a squared grid in 1 inch increments. The 1cm thickness of these mats allows for your blockers or T-pins to be securely inserted and project tautly positioned, without risk of them moving. Perfect for blocking crochet, needlework and knitting projects, keeping your swatch and panels consistent in size, neat and accurate. With stand temperatures of up to 60 degrees.