# SKU options

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SKU options are market-defined add-ons that customers can attach to SKUs during an order. They can affect price or delivery lead time, and their cost is automatically added to the line item's amount.
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## What is a SKU option?

[SKU options](/core-api-reference/sku_options.md) represent any custom personalization or additional service defined by a market. Customers can add these options to selected SKUs during an order. The additional service can affect the price or delivery lead time of an SKU due to an update in preparation time. Any additional cost is automatically added to the line item's amount, and the order is refreshed with updated data once the option is applied.

SKU options can be predefined per market with the related SKU codes, delay time, or price. Typical examples include engraving, customized prints, and customized wrapping. To add one or more SKU options to a line item, you need to create a line item option.


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