Unset shipping method based on Product variation

I have some meal packages to sell. For example.
Chicken meal has variations: 10 pack, 14 pack, 18 pack.
I want to disable flat_rate:3 when people order 10 pack. But I don’t know how to get the variation.
My code is below:

function hide_one_delivery( $rates ) {
    global $woocommerce, $product;
    $10_pack = 0;
    foreach ( $woocommerce->cart->cart_contents as $product ) {
        // What to put in this loop??
        $10_pack += 1;
    }
    if ($10_pack > 0){
        unset( $rates['flat_rate:3'] );
    }
    return $rates;
}
add_filter( 'woocommerce_package_rates', 'hide_one_delivery', 100 );

Thank for help.