These handy field sketch books feature a super sturdy black double wire spiral binding with heavy black embossed front and back cover. Each sketchbook has 80 sheets of premium acid-free, 110 gram (70 lb.) weight, light cream colored paper with a fine even surface texture. This style of sketchbook is great for field use since you can flip over the used sheets and use the covers as a stiff backing support. This style is very popular in 5.5x8.5", 7x10" and 8.5x11" sizes.