Two different styles, each style has two different sizes. Have your students write down another students name, and visa vera, on each "hour". This is a great way to partner students quickly and you don't have to worry about students only partnering with their best friends. When starting a partner activity, simply tell the students which partner they will be with (3 o'clock partners, 1 o'clock partners, etc.) and they are ready to go. Great management tool!