WooCommerce number of archive products per page

/*  Change WooCommerce Archive products number per page */

add_filter( 'loop_shop_per_page', 'my_new_products_per_page', 9999 );

function my_new_products_per_page( $pr_per_page ) {

  $pr_per_page = 16;

  return $pr_per_page;

}