ISI Beryllium Copper
T
he ISI (beryllium copper) head offers
playability when you want it and forgiveness when you need it.
With the same performance features and extreme weighting design as
the ISI Nickel, the density of the ISI's copper head allows us to intensify
weight in key areas to provide maximum forgiveness on off-center hits,
yet maintain an appealing size and appearance.
The company:
http://www.pinggolf.com