The prototype was sliced open and filled with the carbon fibre honeycombe, something about making the bat stiffer but much lighter, it did go into production with no carbon fibre visible unlike the prototype which could be seen on the shoulders and toe I think, these bats went out with a few pros on an england tour I believe, Darren maddy being one of them, the bats from what I'm led to believe performed very well, but the MCC got involved and banned the use of carbon fibre, my neighbour and his friend, an owner of hunts county had meetings at MCC to fight there case but lost, at this point I believe the laws of bat making were changed to must be entirely made from wood, so my neighbour was instrumental in changes the laws of cricket.
On a side note , I don't remember the Eclipse but funnily enough I was servicing a boiler a few weeks ago when I spotted a bat in the corner of the cupboard, an Hunts County Eclipse, I really liked the shape of it tbh and took some photos, was thinking of having something similar made, I will post some pictures later of it.