All notebools graph paper.  Choose from the following sizes: 
 
N18 (Large) - 8.25 x 11.75" 
N16 (Medium) - 5.8 x 8.3"
N12 (Small) - 3.375 x 4.75"
N8 (Long) - 2.9 x 8.3" 
 
By Rhodia