Exclude shipping costs from certain products (by product ID )

woocommerce_products_free_shipping.php

<?php
function yikes_woocommerce_free_shipping( $is_available ) {
	global $woocommerce;
 
	// set the product ids that are eligible
	$eligible = array( '360' );
 
	// get cart contents
	$cart_items = $woocommerce->cart->get_cart();

	// loop through the items looking for one in the eligible array
	foreach ( $cart_items as $key => $item ) {
		if( in_array( $item['product_id'], $eligible ) ) {
			return true;
		}
	}
 
	// nothing found return the default value
	return $is_available;
}
add_filter( 'woocommerce_shipping_free_shipping_is_available', 'yikes_woocommerce_free_shipping', 20 ); 
?>