9 Pack Blocking Mats for Knitting & Crochet Project, Extra Thick Knitting Blocking Mat with Grid Lines，Knitting Mats with 100 T-Pins and Storage Bag

I finally finished a crochet shawl and blocked it using these mats. They interlock well, stay together, and are nice & thick. Rust-proof T-pins included. I do need another set for larger projects. I will use these over and over and recommend them to any yarn crafter.

Very sturdy

Pros:-thick-held together well-grids lined up well after I figured it out (see below)-pins included-storage bagCons:-chemical smell which I hope will go away-no instructions on piecing the blocks together. I had to look at the picture of the product to see how they line up. They sometimes needed to be flipped around in order to fit but once I got it it worked well-the pin case won't close/lock againI would buy these again, some instructions would have been useful.

It's a little confusing to make it into one large grid w the nine sqaure, it doesn't quite line up unless you put it together in a very specific way. It does get the job done and I've had no problems using these for a year

These do not work well. They do not fit together well, and the lines of the grids do not line up. They are printed crooked. Do not recommend.

I finally got them to go altogether!! They work great for blocking baby afghans.

Comes with enough T pins, I wish there were numbered measurements but still works, I just use tape to remember the sizing.

I don't like these ones as much as others that I own. They say they are 12" X 12" but that is only if you count the puzzle edges . If you want to block a 12" square of knitting, you must connect more than one mat. . They also only fit together in a certain way and direction. The other two sets that I have are12 1/2" so you have a true 12" square in which to use for blocking. Because of this, these new mats do not fit with my older ones. Not very happy with these.