End Portal Frame

An end portal frame is a block that resembles end stone with a decorative bluish-green top, with sides decorated in hollow rounded rectangles with the same color as the top.

Obtaining
The end portal blocks, like bedrock, are indestructible in Survival or Adventure mode. It can be obtained only by accessing the creative inventory or commands.

Natural generation
The end portal generates naturally in stronghold portal rooms over a pool of lava with a staircase containing a silverfish spawner. It generates end portal blocks in a 5×5 square border, without the corners. Each end portal block generates facing inward, with a 10% chance of containing an eye of ender.

Each stronghold contains an end portal $$, while $$ only some strongholds have a portal. On the, each world contains 128 strongholds, so a total of 1,536 end portal blocks are generated. In the Legacy Console Edition, there is only one portal per world, so 12 end portal blocks are generated.

There is an extremely low chance (10-12 or 10-10% or one in a trillion) for all twelve end portal frames to be filled in strongholds.

The chart below shows the probability of having each number of eyes of ender filled in (some values may be rounded).

Usage
eyes of ender on end portal blocks inserts them to the top of the blocks if it is not inserted previously.

An end portal frame has a front face that faces the player when placed. Although the facing is almost invisible (one can distinguish only 2 rotations of end portal frames), all end portal frame blocks must be placed correctly and face inward in order to be able to activate the end portal, and if all of the frame blocks have eyes of Ender inserted, the portal activates, replacing the inner 3×3 space with end portal blocks.

In the End the end portal blocks teleport entities back to the Overworld, so entering an activated end portal in the end transports the entity to the overworld instead.

Redstone
End portal blocks output a redstone comparator signal of 15 when an eye is present. If there is no eye in the frame, it outputs a signal of 0.

Light source
End portals emit a light level of 2.

Note Blocks
End portals can be placed under note blocks to produce "bass drum" sound.

Piston interactivity
End portal frames cannot be pushed by pistons. They also cannot be pushed nor pulled by sticky pistons.

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