These practical dry erase boards have one side blank and one with a single writing line. Zaner Bloser style guidelines include a red descender line, dotted midline, and room for descenders. Students just write their response quickly to show you immediately." not These practical two sided dry erase boards have one side blank and one with a writing line - a red descender line, dotted midline, and room for descenders. per Zaner Bloser style guidelines.