Heavier, Thicker, Stronger: Finally, heavier, thicker, and stronger agility cones that won't tip over or slide around. LVL10 Sports Pro practice cones are made of thick and flexible PVC vinyl that's 200% thicker than flimsy, brittle, and small plastic cones from the competition.,Won't Crack, Slide or Fly: LVL10 sports cones are weather-resistant, durable, and sturdy.