Marvin cable tailpieces are a totally new tailpiece design for double basses that provide:
New buffer design looks more like a standard tailpiece
Greater Sound and sustain
Less mass/weight muting the vibration of the bridge
Single cable across the saddle does not stabilize the bridge allowing freer movement and vibration.
Greater elasticity of tailpiece allows freer bridge movement and vibration.
Faster bow response
The bridge comes to full vibration faster because tailpiece does not slow the response
Reduced wolf tones
Tailpiece buffering eliminates impact on wolf tones. Wolf tones emanating from the tailpiece or strings below the bridge are eliminated.
Softer feel when fingering
Additional elasticity of cables allow the strings to be deflected by the left hand with less force. The tension of the strings is not different , just the elasticity (ability to stretch).