The Blue Spot Tools 30Mtr (100ft) 3Pce Chalk Line and Mini Level Set is manufactured from ABS Plastic for increased durability. The ideal quick and accurate way to mark the ground with straight lines prior to building work, comes complete with a durable plastic mini line level and 115G of chalk. 30 metre self chalking line The ideal quick and accurate way to mark the ground Suitable for use on Flags, Stone, Concrete, Tarmac, etc. Complete with a durable plastic mini line level Includes 115G Chalk.