Set of 3 notepads, largest pad is gray, stock paper sheets, measures approximately 6" x 8 1/2", it has approximately 20 sheets. Medium pad measures smallest 5 1/2" x 8 1/2", it has approximately 15 sheets and the smallest pad from Kaytee Avian Foods measures 5 1/4" x 8", it has approximately 45 sheets (this pad has no backing).