ItemStack beforeChest = player.getEquipment().getChestplate();

			if(beforeChest.getType() == Material.AIR || beforeChest == null) {
				return;
			}

			NBTItem nbtChest = new NBTItem(beforeChest);
			System.out.println(nbtChest);
			NBTItem nbtWing = new NBTItem(new ItemStack(Material.ELYTRA));
			System.out.println(nbtChest.getKeys());
			for(String key : nbtChest.getKeys()) {
				System.out.println(key);
			}
			enableGlide.replace(player, true);
			beforeEquip.put(player, beforeChest);
			player.getEquipment().setChestplate(nbtWing.getItem());
			player.sendMessage(ChatColor.GREEN + "비행이 활성화되었습니다.");