Magnetic Erasers that are made from a soft, durable foam and feature built-in finger grips. It works on both chalkboards and whiteboards and are magnetic which allows convenient storage right on your magnetic whiteboard. Assorted colors include: Yellow, Red, Green and Blue. Erasers measure 2-1/4" x 4-1/4". Each pack includes 4 erasers. Sold as 3 packs for a total of 12 erasers.