What does Double-Faced Armor do in AoE3?

Meteor Hammer: hit points +15%, ranged resist +0.05; Iron Flail: hit points +15%, ranged resist +0.05; Keshik: hit points +15%, ranged resist +0.05. The game says: "Iron Flail, Keshik and Meteor Hammer armor and hitpoints increased."

Home City card

Double-Faced Armor

Double-Faced Armor (tech ID YPHCForbiddenArmyArmor) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Fortress Age. Effect: Meteor Hammer: hit points +15%, ranged resist +0.05; Iron Flail: hit points +15%, ranged resist +0.05; Keshik: hit points +15%, ranged resist +0.05.

Quick answers (3)

Which civilizations have the Double-Faced Armor card?: Chinese.
What does Double-Faced Armor do in AoE3?: Meteor Hammer: hit points +15%, ranged resist +0.05; Iron Flail: hit points +15%, ranged resist +0.05; Keshik: hit points +15%, ranged resist +0.05. The game says: "Iron Flail, Keshik and Meteor Hammer armor and hitpoints increased."
What is the tech ID of Double-Faced Armor?: YPHCForbiddenArmyArmor.

Iron Flail, Keshik and Meteor Hammer armor and hitpoints increased.

What it does

Meteor Hammer: hit points +15%, ranged resist +0.05
Iron Flail: hit points +15%, ranged resist +0.05
Keshik: hit points +15%, ranged resist +0.05

Cost: 1
Sent from: III
Times it can be sent: 1
Game ID: YPHCForbiddenArmyArmor

In these decks

ChineseIII×1

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).