€¢ 8 oz €¢ Interior or exterior use €¢ Marks are temporary €¢ Provides great visibility >> Irwin Strait-Line® marking chalks have a newly engineered flip-top cap that keeps the chalk in the bottle where you want it and stops it from spilling out in areas that you don't. The flip-top cap; available on all Irwin Strait-Line® chalk bottles; seals the chalk in an air-tight chamber; keeping out moisture and reducing the risk of clumping."