I've been using these pens for a year now and to be honest they are completely useless. Here's a summary: Pros - Works reasonably well on regular cotton. Disadvantages - easily break when sharpened - they wear out very quickly when marking fabric; Expect to sharpen them every few parts of the design you are tracing/marking - due to the softness of the tip, they don't stay sharp for long and make VERY broad lines - they're not ideal for use with a ruler, see previous point - don't work with stretchy fabric as you will have to press hard to mark the fabric which in turn will stretch/deform the fabric. While the idea is great, I get much better results with a regular pencil on non-elastic fabric and the pencil costs 1/10th of that.
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