# `!Send` and `!Sync` Components
[`World`](https://docs.rs/shipyard/latest/shipyard/struct.World.html) can store `!Send` and/or `!Sync` components once the `thread_local` feature is set but they come with limitations:
- `!Send` storages can only be added in [`World`](https://docs.rs/shipyard/latest/shipyard/struct.World.html)'s thread.\
- `Send + !Sync` components can only be accessed from one thread at a time.\
- `!Send + Sync` components can only be accessed immutably from other threads.\
- `!Send + !Sync` components can only be accessed in the thread they were added in.
These storages are accessed with [`NonSend`](https://docs.rs/shipyard/latest/shipyard/struct.NonSend.html), [`NonSync`](https://docs.rs/shipyard/latest/shipyard/struct.NonSync.html) and [`NonSendSync`](https://docs.rs/shipyard/latest/shipyard/struct.NonSendSync.html), for example:
```rust, noplaypen
{{#include ../../../../tests/book/non_send_sync.rs:non_send_sync}}
```
