---
title: "primary wave · RUAL Documentation"
description: "background in primary wave style"
canonical: https://docs.rual.nl/block-types/ui class/uiclass_card_primary_wave
language: en
---

# primary wave

This block is part of the [`ui class`](https://docs.rual.nl/block-types/ui%20class) group and was last modified in core [`v10.4.28`](https://docs.rual.nl/core-versions/100428).

### Parent Requirements

This block requires specific parent elements: `state_card_ribbon`, `state_card_list`, `state_card`, `state_card_icon_box`. Ensure this block is placed within the appropriate parent context.

background in primary wave style

- uiclass `uiclass`

A typical wiring for [primary wave](https://docs.rual.nl/block-types/ui%20class/uiclass_card_primary_wave): the `uiclass` out pin feeds [regular card](https://docs.rual.nl/block-types/state%20ui/state_card).

![Studio canvas example for the primary wave block: typical wiring for primary wave.](https://docs.rual.nl/canvas-examples/uiclass_card_primary_wave.png)

### Version history

Introduced in [`v10.4.28`](https://docs.rual.nl/core-versions/100428).