Silverline Marking Chalk Available in Blue, Red and White Silverline Blue Marking Chalk CB63B Silverline Red Marking Chalk CB63R Silverline White Marking Chalk CB63W Micro-fine chalk powder in squeezy bottle with pouring spout for quick and easy free-hand marking. For use with chalk lines in construction applications requiring a temporary straight line. Micro-fine coloured powder Squeezy bottle with pouring spout Quick and easy line marking For creating temporary visible lines on surfaces including brickwork Weight 249 g