Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_51 ( ihsaa_class VARCHAR, size VARCHAR, mascot VARCHAR )

### Question ###
What is the IHSAA class of the school with less than 400 students and a mascot of the Tigers?

### Accurate SQL ###

SELECT ihsaa_class FROM table_name_51 WHERE size < 400 AND mascot = "tigers"