woocommerce custom product data field

I am trying to add something to my functions.php so i can add a size field below Sale Price in the General area of the Product Data.

I would prefer to have a drop down with the sizes available and you would select one that would appear on the product page below the title.

The closest I could find is the following, it worked but it wasn’t what I needed because it has a dollar value to it, I don’t need that. I got it to work and tried changing it to fit my needs but can’t figure it out.

Here is what I used:

(I got it from here: http://gerhardpotgieter.com/2013/09/17/woocommerce-custom-product-fields/)

add_action( 'woocommerce_product_options_pricing', 'wc_rrp_product_field' );
function wc_rrp_product_field() {
    woocommerce_wp_text_input( array( 'id' => 'rrp_price', 'class' => 'wc_input_price short', 'label' => __( 'RRP', 'woocommerce' ) . ' (' . get_woocommerce_currency_symbol() . ')' ) );
}

add_action( 'save_post', 'wc_rrp_save_product' );
function wc_rrp_save_product( $product_id ) {
    // If this is a auto save do nothing, we only save when update button is clicked
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
		return;
	if ( isset( $_POST['rrp_price'] ) ) {
		if ( is_numeric( $_POST['rrp_price'] ) )
			update_post_meta( $product_id, 'rrp_price', $_POST['rrp_price'] );
	} else delete_post_meta( $product_id, 'rrp_price' );
}

add_action( 'woocommerce_single_product_summary', 'wc_rrp_show', 5 );
function wc_rrp_show() {
    global $product;
	// Do not show this on variable products
	if ( $product->product_type <> 'variable' ) {
		$rrp = get_post_meta( $product->id, 'rrp_price', true );
		echo '<div class="woocommerce_msrp">';
		_e( 'RRP: ', 'woocommerce' );
		echo '<span class="woocommerce-rrp-price">' . woocommerce_price( $rrp ) . '</span>';
		echo '</div>';
	}
}

// Optional: To show on archive pages
add_action( 'woocommerce_after_shop_loop_item_title', 'wc_rrp_show' );

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I thought I had the answer with this link, it looked liked it would work but I tried it and had no luck:
http://www.remicorson.com/mastering-woocommerce-products-custom-fields/

My brain is mush at this point, any help is greatly appreciated.

Thank you.