It is the pink, Bo Bunny flexible ruler and it is definately flexible. I have used it a couple times and it is great for making wavy lines. I typically use a straight line if I use DP on my cards and now I can make a wavy line and it is kind of fun and funky! It makes for a different look and yet the lines are crisp. Plus ladies......... it is PINK, my fav color of course! So, if you've seen it and thought about purchasing it- go ahead, it is fun and you will get your money worth out of it.
Oh, and here is a card that I made using the flexible ruler. It truly just let me flex it to whatever I wanted, made a line with pencil and then cut it out. You could do the line at an angle, wavy of any type....... really the possibilities are endless! This card is artichoke, then I used our DP from SU, the new scallop circle (not sure mine is going to hold up though!)
Have a good one!