Expo 90% Recycled Sidekick Organizer With Markers And Eraser is a convenient kit to have if you have a dry erase board.  You get four different colored markers, an eraser, and a caddy to hold everything in one place.  You can hang it near your board by magnet or by a sticky strip.  I placed mine by using the sticky strips.  It is secure and holds up well.  It is nice to be able to have everything in one place and to have an eraser on hand to make clean up easier.  The markers work well and are sharp and bright colors.  I use mine at home, but this would be good in an office or classroom.