WP_QUERY post_in problem

why when i using this code :

$paramss = array('post_in' => array( 760, 761) , 'post_type' => 'product');
$wc_querya = new WP_Query($paramss);

i get 5 products list and not only product with id 760,761 ?

Regards

$paramss = array( 'post__in' => array( 760, 761 ) , 'post_type' => 'product' );