The chair, presented as part of Moss' Heavy Metal show in Miami, is made of expanded polypropylene covered in nanocrystalline copper.
The series of eight chairs is based on the same expanded polypropylene chairs that Dixon gave away for free in Trafalgar Square in September 2006, during the London Design Festival.
Here's some info from Moss:
by Tom Dixon, UK
an expanded polystyrene chair, clad in an electro-deposited layer of 99.9% pure copper
This Studio piece, highly experimental, is produced in a signed and limited edition of eight pieces, exclusive to Moss.
This remarkable new copper chair is based on Dixon’s extremely lightweight Expanded Polystyrene Chair (EPS Chair), first introduced in 2006 during the London Design Festival. At that time, 500 EPS chairs were given away during an installation in Trafalgar Square in what became a notorious frenzy.
With CU29, nanocrystalline copper is ‘grown’ onto the EPS Chair using a highly sophisticated electroplating process. During full immersion in a liquid bath containing pure copper crystals, the textured surface of the chair’s intricately curved industrial form attracts the honeycombed-patterned crystals, resulting in a unique copper cladding, extremely strong yet surprisingly lightweight.
height: 28 3⁄4”; width: 36 1⁄2”; depth: 36 1⁄2”