1 cotton/nylon line 30m/100ft 2 4 Ounce Chalk Refill Bottl 3 For home ,professional,industrial 1 cotton line holds more chalk for multiple line strikes 2 Holds approximately2 oz. of chalk 3 Marks any surface including wood ,brick,metal 4 chalk view window , to view how much chalk powder is left. 5 professional use: carpenters,brick layers, concrete&stone masons,floor&wall tilers,roofers,painters& decorators