Various greases. For a good how to lube guide, check out Top Clack's guide by Quakemz. Please note that there are various methods and guides for lubing mechanical keyboard switches.
All lubricants will come in glass containers and will have approximately 5ml of product. While we tried to make sure that all are filled equally, some jars may have slightly more or less. The Krytox GPL 105 is shipped in a .5oz bottle.
NovelKeys is by no means an expert in lubing, so please do some research within the community, as we won't be able to answer a lot of questions when it comes to the lubing process.