Clip on message signs fits all open top cones. Simply clip into the cone opening and you now have a write on/wipe off ABS plastic board sign for many uses such as station messages, etc. Blank write on board uses dry erase markers (vis-a-vis markers only) on either side and measures 12"W x 13"H. *Fits in 6”, 12" or 18" cones only! Cones sold seperately.