Get Product Size in magento

<?php
require_once 'app/Mage.php';
Mage::app();

$product_sku='NTWFW12FB052OR41';
$productId = Mage::getModel("catalog/product")->getIdBySku( $product_sku );
//$productId = 29763;
echo $productId;
$product = Mage::getModel('catalog/product')->load($productId);
$attributes = $product->getAttributes();


foreach ($attributes as $attribute) {  
$attributeCode = $attribute->getAttributeCode();
    $code = 'csize';// your product attribute name here
    if ($attributeCode == $code) {
        $label = $attribute->getStoreLabel($product);  
        $value = $attribute->getFrontend()->getValue($product);
        echo $attributeCode . '-' . $label . '-' . $value;
    }
}

?>