Crafty World Professional Self-Healing Double Sided Rotary Cutting Mat - Long Lasting Thick Non-Slip 12" x 18" Mat that Provides Easy Cuts for Fabric, Quilting, Sewing, and All Arts & Crafts Projects

have not had a chance to use it yet

I love this thing, but I wanted to take this space to warn others: DO NOT put anything hot on it. At all. I'm not taking any points off it because the instructions do actually tell you this, but I didn't anticipate how little it'd take to ruin it. I set down a microwaved TV dinner on it, in its plastic container and on a thick paper towel, and 10 minutes later the mat would no longer lay flat.I used a powerful hair dryer on it and left it under some heavy books for a day, but it was never the same. Ended up trashing it and getting another.Again, no points off; that was my fault. But boy, when the instructions say no heat, THEY MEAN NO HEAT.

I only give this mat 4 starts because when it arrived it smelled HORRIBLE. It had a very very strong plastic scent. With me being pregnant I was concerned the smell was never going to go away. I left it outside over night and by the next morning the smell had diminished but I could still smell it. I left it over night one more night and the smell has gone away completely. I will say that this mat does feel and look very durable.

UPDATE. The company offered to refund, which I feel warrants a change in the rating. I admit to being super-sensitive to smells. The chemical smell was too overwhelming in this case for me to even try to fix it using the process recommended. I still feel that a new product should not give off such a strong and unpleasant odor, but I'm sure that others would not be as distressed by it as I was. ORIGINAL POST (edited): The chemical smell was so bad I had a headache in 30 seconds and within a minute, the smell was all over the house. I had to throw the mat away. There were instructions to wash it in water and vinegar but I couldn't deal with that. I've owned multiple cutting mats over the years. I've never experienced any odor like this.

The lines are there to ‘square’ your fabric cutting. I use this item to cut fabric. I see the vertical and horizontal lines to confirm cutting the line in a square. The bias line can also be seen.