227g (8oz) refills for chalk lines in a variety of colours. Keson chalk sticks to your line until you decide you want it to stick to something else. Snapping a line with Keson ProChalk achieves a perfect line every time. Brilliant colour tones provide strong, sharp lines. The colour and the amount of the pigment determine the vividness and permanence of the line. Over the years, Keson have fine-tuned the formula to produce chalk that performs with consistent excellence. Made in USA.