CHALK LINE REEL 100' 1.5MM LINE. This Bold Chalk Line spool is often used in outdoor and high traffic areas to provide permanent or temporary straight lines. The composition of a string and how it is assembled generally determines how much chalk a line lays down and how much chalk a line contains. Two or more strings can have the same material and diameter, but have different performance depending on their structure. The bold lines share a strong resemblance to a chisel marker and felt tip, and the unique shape helps make corner work easier.Synthetic lines lower and take up less chalk and are unaffected by moisture. This durable rope has a grommet chalk fill closure for secure closure and easy opening. Its steel crank, being resistant, increases its durability.