Name your spec with something relevant to the product as it is possible to have multiple specs included under a single product and you want to be able to distinguish between each one. For example, one bottle shape may apply to all of the bottles, but they could each have a different neck type, or be manufactured in a different plastic material. Click the edit pencil icon to open up the content options and check the applicable boxes within the specification. If you do not check a box, then it won't show on the published page. Don't forget to 'Save Changes' once you've finished.