Outer frame is more than 1/3 lighter than normal construction, but still stiff enough.
This drum is part of an ongoing project to create super-light frames which are still stiff and 'lazy' enough to privide the necessary environment for a proper working sound system of tuning rim and skin.
The problem is not to make light frames. The challenge is, to make a light frame which is still stiff enough, lazy enough, but have the certain amount of resonace AND is not too fragile for dents and scratches.
...we are on a very, very good way ! ;)