When you list the materials, include the description of the materials, the quantity you’ll need, the cost per piece, and the total amount of that material. Your description should also be easy for the customer to understand, so they know exactly what work was done.
You may refer to your invoices in the future, so the details will help you remember exactly what you did. Mention any specifics, not just the general type of job, where possible.
The description of the work to be done should be brief, but it should be detailed as well.