Remove link to attached image using the_attachment_link

trying to find a way to remove the link to the images once they are pulled into the page.

any ideas?

<ul id="sponsors">
<?php
$args = array(
'order' => 'ASC',
'post_type' => 'attachment',
'post_parent' => $post->ID
);
$attachments = get_posts($args);
if ($attachments) {
foreach($attachments as $attachment){
echo "<li class='boxshadow'>";
the_attachment_link($attachment->ID, array (width,height));
echo "</li>";
}
}
?>
</ul>