[development] How do I restrict the custom urls to a specific role?

How do I restrict the custom urls (listed below) to a specific role? //hook_menu() function custom_subscription_menu() { $items = array(); $items['admin/store/free_subscription'] = array( 'title' => 'free_subscription_form', 'description' => 'free_subscription_form', 'page callback' => 'free_subscription_form', 'access callback' => TRUE, 'type' => MENU_CALLBACK, ); $items['admin/store/process_free_subscription'] = array( 'title' => 'process_free_subscription', 'description' => 'process_free_subscription', 'page callback' => 'process_free_subscription', 'access callback' => TRUE, 'type' => MENU_CALLBACK, ); return $items; }