Aerosol White Chalk is safe to use on most surfaces and can be easily removed by pressure washing. Great for grass, pavement, soil and gravel. Is water based, non-clogging and non-flammable. Our CHALK has the versatility of temporary marking with the convenience of an aerosol can. Universal tip will work in ALL striping machines and marking wands. 20 oz. disposable cans (18 oz. net weight) and is sold in cases of 12 cans. As with any product, it is recommended that you test a small area to make sure there will be no adverse affects. Do not use on synthetic turf.