# Shielding Shield transactions are executed publicly, using a public wallet. Under the hood, the shield action sends ERC-20 tokens into the RAILGUN contract, where they are associated with a RAILGUN Wallet and a private balance. Once shielded, the owning RAILGUN Wallet can initiate [private transfers](/developer-guide/wallet/transactions/private-transfers.md) and [cross-contract calls](/developer-guide/wallet/transactions/cross-contract-calls.md) to interact with external smart contracts. ***NOTE***: Do *not* shield rebase tokens into RAILGUN, as these are not supported. For a list of rebase tokens, see [Rebase Token List (Coingecko)](https://www.coingecko.com/en/categories/rebase-tokens). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.railgun.org/developer-guide/wallet/transactions/shielding.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.