12 ve SP white caps
12ve mod - one of the most popular in Chinese community. Was made by 12ve, a member of PSH community.
Maybe, as a main mod you should take another one. For example - Flying Panda or Waterfall. 12ve mod has a two half grips of Dr. Grip, what can create problems for beginners, who want to learn wipers.
But as addition to the collection this mod is needful for any penspinner. This is a writing mod with stem inside. You can remove stem, and mod will be lighter.