PLATIS 54 and PLATIS 65 are passive isolation platforms to minimize vibrations reaching audio components. The base frame is made from solid aluminum supported by adjustable feet. The top supporting plate is a hard laminated plate reinforced with a solid aluminum plate. You can also purchase a top plate (hard laminated plate only).
The upper plate and lower frame are separated by multi-layer silicone & aluminum dampers, which filter vibration in the audible range. See the DEWESOFT graph photo measured with the DEWESOFT system:
DEWESOFT X DSA vibration system- modal hammer test
YELLOW GRAPH- vibration on audio component
RED GRAPH- vibration on audio component isolated by PLATIS 54
M. Fremer’s video from Munchen show https://www.youtube.com/watch?v=MskXDytxwnw&feature=youtu.be watch from 27 minutes onwards MF talks to Franc Kuzma about Platis and vibrations.