WHITEBOARD TRAY - This Eraser try gives you the ability to store easily store erasers and more MAGNETIC - No need to worry about losing this tray, as it includes a magnetic back that sticks to any magnetic white board ABS PLASTIC - Strong, high impact ABS plastic makes this tray durable and long lasting MULTIFUNCTIONAL: Hold more than just erasers in this tray. With the ability to also hold markers and office supplies COMPATABILITY: Pair this Rumba Magnetic Eraser Tray with a Rumba Screen for a great fit