Help with "stripped_content"

Hi to all, so i have changed my shop view.
Now all looks good except a product description.
I want also show product description striped html.
In my default theme i found a code which is working for WP..

So can somebody help me what need to add to make code working?
I am editing file: content-product.php

Using code ( from my WP theme )

<?php
$stripped_content = tf_content( $data['excerpt_length_blog'], $data['strip_html_excerpt'] );
echo $stripped_content;
?>

Thx

http://wordpress.org/plugins/woocommerce/