# Overview

An OM pool includes:

* **Index Price Feed:** The price feed used to open and close long and short positions.
* **Long Token:** The token backing long positions.
* **Short Token:** The token backing short positions.

For example, in an SEI/USD market:

* **Index Price Feed:** SEI/USD
* **Long Token:** SEI tokens backing long positions
* **Short Token:** USDC tokens backing short positions

In single-token pools, both the long and short tokens are the same, such as in a wSEI pool.