Both the Slim & Trim use Cross Ballpoint refills. The Mini uses Parker Ballpoint refills. Both of these can be found at just about any local office store.
The pens come in black windowed foam lined boxes with a magnetic closure to keep them safe during shipping and can be used as a gift box. There will be other boxes available after the campaign in BackerKit for you to select as upgrades & add-ons.
You can do this two ways:
1. You can select one reward and add up the cost for all the rewards you'd like and enter the total amount in Kickstarter.
2. You can select one reward and then add-on additional rewards in BackerKit after the campaign is over.
7MM Medium Standard Lead that can be purchased at just about any office store.
Don't see the answer to your question? Ask the project creator directly.