Filter WC price display

wc-price-display.php

function sv_change_product_html( $price_html, $product ) {
	if ( 337 === $product->id ) {
		$price_html = '<span class="amount">$15.00 per kg</span>';	
	}
	
	return $price_html;
}
add_filter( 'woocommerce_get_price_html', 'sv_change_product_html', 10, 2 );


function sv_change_product_price_cart( $price, $cart_item, $cart_item_key ) {
	if ( 337 === $cart_item['product_id'] ) {
		$price = '$15.00 per kg<br>(7-8 skewers per kg)';
	}
	return $price;
}	
add_filter( 'woocommerce_cart_item_price', 'sv_change_product_price_cart', 10, 3 );