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_16409745_1 (dpi VARCHAR, max_page_size VARCHAR)

### Question ###
What is the dpi for the scanner with a max page size of 216mm x 355mm?

### Accurate SQL ###

SELECT dpi FROM table_16409745_1 WHERE max_page_size = "216mm x 355mm"