Two types of graph paper used in chemistry experiments at university. Semi-logarithmic graph paper: approximately 20 sheets 1mm grid graph paper: approximately 70 sheets They're surprisingly expensive to buy at the university co-op, etc. These are leftovers from being used, but there's a decent number of sheets and they're clean, so please use them. Please read the profile carefully, and consider purchasing after confirming and understanding the product images and description. Instant purchase OK. Price negotiation OK. Returns are not accepted after purchase.