Damaging individual components is a normal, even necessary part of the process of experimentation and learning. We specifically did not put protection on the individual SeeBlocks, as you need to experience the effects of mistakes to learn electronics.
Never treat damaged components as a bad thing, but rather an opportunity to learn what went wrong.
The first component to blow with a too high current is normally LEDs. SeeBlocks Kit 1 comes with 4 Red LEDs, but there is always room for more! Purchase our replacement pack, consisting of 5 Red LED SeeBlocks.