Custom Post Type on index tamplate

<?php
        $args = array( 'post_type' => 'slug', 'posts_per_page' => 10 );
        $loop = new WP_Query( $args );
        while ( $loop->have_posts() ) : $loop->the_post();
          the_title();
          echo '<div class="entry-content">';
          the_content();
          the_post_thumbnail();
          echo '</div>';
        endwhile;
        ?>