There are two lines of Odyssey Black putters. There is the regular Black Series which has a milled face and no insert. Then there is the Black Series i which has an insert. Both lines of putters are made of carbon steel and have Tungsten weights on the back of the putter to get the weight low and away for a higher MOI.
At the Edwin Watts here the Odyssey Black putters are $279, so for $20 more I went with the Scotty.