Negative/Positive Number Lines -50 to +50 Pack of 5

This essential negative/positive number line is available in 2 versions, each calibrated with numbers at 20mm intervals and alternate decades red and blue. The -10 to +10 vertical line, in packs of 10, has an overall length of 440mm; the -50 to +50 line is 1m long and comes in packs of 5.