Lakeshore Learning Number & Counting Magnetic Math Tin & Teachers guide This all-in-one magnetic math tin—where the lid becomes the activity board! Students just lift the magnetic lid off the sturdy storage tin, flip it over and place one of 15 different activity mats inside. Then they use the easy-grip magnets to fill in the blanks. Kit Includes: *activity tin * 15 mats (5 complete the number sequence, 5 show how many, & 5 count the…. ) *20 magnets 1-20 Tin measures 8 3/4" x 10 3/4".