I don't put anything on the back of them although I know there are several products around that are very good to use. I simply put my pinky finger off the edge of the ruler onto the fabric. I also place my hand more in the middle of the section I am cutting. For example, if the fabric is 24", I will place my hand at about 10"-12" up from the bottom edge of the fabric. I hope that makes sense. I haven't had any problems with slippage. :wink: