I recommend reading the API docs. http://jd.bukkit.org/rb/apidocs/org/bukkit/material/MonsterEggs.html And I can't check right now (eclipse is froze and I got a movie going) but perhaps doing something like MonsterEgg. or Monster_Egg. or something that will show when you type it (forgot the name of it, it's the menu that gives a list of the functions/methods).