These are the components of a recent keyboard, China-made as, indeed, are most. Colours are amazing. The turquoise cups are lovely and there was one lowly pink one, purpose of which, I am uncertain. It's these little rubber cups that give your keyboard keys a bit of a spring when they are depressed.
I don't know what most of these items are called or what they do but it sure was satisfying taking the board apart and finding them.