This is a flashcard set for all 214 radicals of Sino-Japanese script, as described in classic Chinese Kangxi dictionary (http://en.wikipedia.org/wiki/Kangxi_Dictionary).
Primary intent behind this pack is to help people learn Japanese Kanji/Chinese characters, by allowing them to visually decompose each character into its constituent radicals, and thus memorize characters not by strokes, but by big and meaningful stroke groups, which eases the task immensely.
ATTENTION!!! This pack requires high-quality Unicode font! For instance, at the moment of writing, having only standard Windows fonts is insufficient for all characters to be displayed correctly.
Public domain and Wikipedia.