What is a COLOP s226 Green Line number stamp?This eco-friendly self-inking stamp features x6 4mm number bands which each print 0-9. Simply turn the wheels to set your numberThe stamp is made from 80% recycled plastic, making the stamp ideal for regular use.Self-inking means that the stamp is fitted its own ink pad which will give thousands of clear and crisp impressions once dry, replacement pads can be bought separately and are easily fitted.