"Not small"
No, but it's very fluffy ... I'd need to know the weight of an adult to have a real concept of the size! My old off-the-streets calico was 12 lbs. at her biggest.
Big ol' cats. About the size of a Maine Coon - 18 lbs for a moderately big male. Mrs Felis' cousin lives with one, never checked but he looks to be in the high teens (the cat not the cousin). Nice disposition though.