i bought this new seam ripper that is specifically for ripping out serged seams, which if you have tried to take them apart you know they are a...well, they don't come out easily. but this little thing is razor sharp, and cuts all the little threads (and the fabric if not careful!) and makes it so much easier to rip out serged seams! however, so far, EVERY time i have used this, i required a band-aid. did i mention it is razor sharp?!