Cali Kingsnakes are pretty well known for being aggressive. I had one for about 3 years and never got struck once, but every other cali king i've seen has been high strung. I think if you get them when they are really little and just handle them fairly regularly they MIGHT turn out less aggressive, but don't count on it. On the bright side, once they latch on to your finger, it shouldn't take more than a minute before it releases! hehe