Do I need to escape this?

I have a function similar to this in my functions.php file:

<?php
if ( ! function_exists( 'fun_list' ) ) :
function size_list( $type ) { ?>
		<ul class="<?php echo esc_html( $type ) ?>-list">
			<li><a href="#">Small</a></li>
			<li><a href="#">Medium</a></li>
			<li><a href="#">Large</a></li>
		</ul>
<?php }
endif; ?>

I call this function from within my template files like so:

<?php size_list( "main" ) ?>

I’m quite confused about what actually needs to be escaped, is esc_html necessary in my function?