Eliminate Prices from customer emails

I am shipping free goods to my customers, so there is no need for prices in my shop. Hoy can I alter the line

echo $order->email_order_items_table( $order->is_download_permitted(), $displaysku, $order->has_status( array( 'processing', 'completed' ) ), $displayimage, array($imgsize, $imgsize) );

for prices to be eliminated from the order table in emails?

https://www.ads-software.com/plugins/woocommerce/