No, he is not a carrot. A tiny little point inside the proton and neutron, he is friends forever with the Up Quark. Down Quark is also part of the Everyday Matter 6-pack and the Quark 6-pack.
Approximately .8 oz/22 grams; 3 inches/6 cm across.
For ages 5 and up as it contains glued-on/small parts.