from The Colchester Archaeological Trust

Objects of unknown function. The eight rods are all the same shape but are of two sizes and two materials. hence, there are two small iron rods, two small copper-alloy rods, two large iron rods, and two large copper-alloy rods. They may have been used for divination which, in this case, might have involved casting the rods to detect messages from the gods. They were associated with eight rings which lay next to them.

More info and links for this find can be found in this forum post.