I use them on front and back and love them--and they will lose their stiffness if used. You can use a blow dryer to soften them until that happens. I use the small 2" ones to center the quilt and "tack" down the section I' working on, then attached the longer snapper as I remove the little ones. I use 3 long ones front & back. I always attached the center first and then do the 2 ends(that are using different snappers). Also, I always leave the snappers on the rods on the leaders which helps too. also, someone suggested to use the heel of your hand and push the snapper on using the bar as the hard surface to push against instead of your fingers and hand.