The Caltrop is designed to take the wind out of the equation when you walk up to that tough putt. Overstable enough to prevent too much air play and featuring a raised thumb grip, the Caltrop will help make even the windiest courses seem calm! Zero Line plastic is awesome with a sticky, but not tacky feel to it. Great for leaving your hand and sticking to the chains. Zero is now made in Megasoft, Soft, Medium and Hard types to suit the player's preferences and climate!