I have all the sizes....love to use my 60mm when cutting full width strips. use my little 18mm when cutting curves or small items.....my 45 is my pinking blade.....I have always purchases Olfa blades, but may try a Gingher blade with a Joann coupon. Like the Olfa handle that I have for my 60 that self closes when not in use, as I always forget to manually close my 45 and end up nicking myself every time....