Thill Pro Series Slip Bobber/Float - Thill Pro Series Slip Floats have a grommet insert which makes each Thill Pro Series float the most slippery and line-friendly slip float around! Designed by Greg Bohn, Mr. Slip Bobber and author of Master the Art of Slip Bobbering, the grommet insert makes each Thill Pro Series float the most slippery and line-friendly slip float around! Available in weighted and unweighted models, four sizes each, these premium balsa floats display easy-to-watch fluorescent hi-vis colors.