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: the selection of the raw material was based on the principle to keep the natural appearance of the wood as much as possible - therefore plywood was selected, for it bears the wood grains still strong and thin enough. Owing to this naturalness small changes in color and pattern may occur compared to the images attached. - 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, second hand sweeps around. It runs with 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 This item is made to order, production lead time is ~1 week. 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.