Teachers in Ohio’s largest school district on Monday will be walking picket lines after voting to go on strike, two days before classes are scheduled to resume.

More than 94% of the Columbus Education Association members voted to reject the school board’s final offer late Sunday, the Ohio Education Association said. The union represents more than 4,000 teachers, librarians, nurses and other employees.

“This strike is about our students who deserve a commitment to modern schools with heating and air conditioning, smaller class sizes, and a well-rounded curriculum that includes art, music and P.E,” the union said in a statement,