Get custom attribute in woocommerce

Solution for : Get custom attribute in woocommerce

Below is code/function to Get custom attribute in woocommerce.

If attribute key is "pa_specification"

function woo_new_product_tab_content() {
    // The new tab content    
    global $post; 

    $product_id = $post->ID;

    $product = new WC_Product( $product_id );

    $pa_value = $product->get_attribute('pa_specification'); 

    echo $pa_value; 

}