GRANNUS Microfiber magnetic whiteboard erasers has strong magnet inside the corner of the cleaning cloth so it can hold it on any steel surface and it is always handy when you need it.No more “Where is the eraser ?”.Each of our white board dry erasers are made of 100% quality microfiber and are with size 11.8” x 11.8” ( 30 x 30 cm ).The magnetic dry erase board erasers are washable, reusable and suitable for wide range of white boards (large and small), including standard whiteboards, calendar, memo, marker boards, rolling, classroom calendars, easel, wipe off boards, weekly, lined, double-sided, classroom borders, student and personal, home and kitchen use, furniture, desk, household, garage, mirrors, glass.Please hand wash in warm water. DO NOT use washer or dryer. We ask you not to use fabric softener or bleach.Product Key Features:100% MicrofiberPack of 4Ultra strong magnetReusable and WashableSize 11.8 x 11.8 inches ( 30 x 30 cm )