public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args)
    {
        if ( !(sender instanceof Player) )
        {
            return false;
        }
        Player player = (Player) sender;
        if (commandLabel.equalsIgnoreCase("colour"))
        {

        if (player.getItemInHand().equals(Material.LEATHER_HELMET))
        {
            if (args.length == 1)
            {
                if (args[0].equalsIgnoreCase("red"))
                {
                    player.sendMessage("DZIALA");
                }
            }

        }
        }
        return false;
    }