This clock was inspired by radioactivity - hence the name. The central core (the raw wood disk) symbolizes the atom that emits the particles all over the space. - Material: plywood (birch) - 6mm - Manufacturing process: the central dial and the spikes of this clock are laser cut from a 6mm birch plywood board, after polishing the spikes are hand painted with 3 different shades of purple, then distributed evenly and clamped manually on the dial. The central disk remains untreated. Owing to the manual distribution process none of these clocks are identical. - The movement: is silent / non ticking - Battery: 1pc. AA type 1.5V battery (not included in the package). - Hands: are made of white plastic. - Dimensions: diameter: 29cm / 11 in depth: 3,3cm / 1 in weight: 0,3kg / 0.7lb - Production: 2-4 days - Shipping: ~5-9 days Feel free to request custom color schemes made just for you - contact us before placing the order. The 'Radium' models generally require at least 3 shades for the spikes in order to reach the organic look. Color customization cost no extra fee.