That'd be the size of the lead. I use 0.7mm- not by choice though. I'd rather 0.5mm, but I have an AWESOME lead holder that only comes in 0.7mm http://www.penshop.co.uk/media/catalog/product/cache/1/image/5e06319eda06f020e43594a9c230972d/r/a/radC7190_1.jpg It's lovely to use <3 I specially get in 2H leads in this size cause it's uncommon in New Zealand :/ It's worth it though
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