Phantom Membrane

Phantom membranes are leathery animal skins obtained from killing phantoms.

Obtaining
Phantoms drop 0-2 phantom membranes when killed by a player or tamed wolf. Looting increases the maximum drops by 1 per level, for a maximum of 4 with Looting III.

Tamed cats have a 3.22% chance to bring the player phantom membranes as a gift.

Repairing
Phantom membranes can be used in an anvil to repair elytra, restoring 108 durability points (25% of the elytra's total durability) per membrane while preserving the elytra's enchantments.

Brewing ingredient
Phantom membranes are used to brew slow falling potions from an awkward potion.