Tranfreight shipping method is not showing for some of the products

$pdtOption = $_product->getResource()->getAttribute('product_in_carton')->getFrontend()->getValue($_product);
                        if ($pdtOption == 'Yes') {
                            $_item['item_palletised'] = 0;
                        }
                        else {
                            $_item['item_palletised'] = 1;
                        }
                        $_item['item_palletised'] = 0;
{
                        $_item['item_length'] =$_item['item_length'] ? ($_item['item_length'] / 10) : $_item['item_length'];
                        $_item['item_height'] =$_item['item_height'] ? ($_item['item_height'] / 10) : $_item['item_height'];
                        $_item['item_width'] =$_item['item_width'] ? ($_item['item_width'] / 10) : $_item['item_width'];
                    }