Flat File is a trinket in The Binding of Isaac, added in the Repentance DLC.

Causes all spikes to retract, preventing them from dealing damage.

Works on Curse Room doors, Spiked Rocks, Spiked Chests, Spike-enemies, and Spikeballs (unless spawned by Singe).

Also retracts the spikes in Sacrifice Rooms, but the trinket can be dropped in order to use the room.

Does not prevent spiked attacks from The Pile or Mama Gurdy.

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this trinket for the previous Repentance version, check this page instead.

The following special synergies and interactions for Flat File have been documented.

* Note that not all possible synergies and interactions are listed here.

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

Flat File

• Causes all spikes on obstacles, doors, and chests to retract
• Golden Trinket (without Mom's Box): Bosses spike attacks, Grudge, and ball & chains have their spikes retracted
• Mom's Box: Bosses spike attacks, Grudge, and ball & chains have their spikes retracted
• Mom's Box + Golden Trinket: Bosses spike attacks, Grudge, and ball & chains have their spikes retracted

• Check out the trinket description on the external Isaac Wiki.