What is a SKU number? Every product you sell needs a unique identifier—called a stock keeping unit (SKU)—that helps you differentiate one product from another. ... Each variant of a product should have different SKUs. In the case of the t-shirt, you'd need a unique SKU code for different colors and sizes.

Should all SKUs be same length?

SKUs are alphanumerical in nature and can be up to 40 characters long (the ideal length). SKUs should not be confused with model numbers, even though they do have the same qualities.

What makes a good SKU?

SKU Best Practices

Make them simple enough so others would understand them. Use the first area of the SKU to group the products together and use the last part, after the dash, for the unique values. Once you have your SKUs set up correctly you should find it much easier to manage orders and product lists.