NUMEN lights differently each time you give it a new look and shape. With NUMEN, you can let your inner creativity loose and bend the NUMEN to whatever your heart desires. Challenge your wildest imagination! NUMEN is constructed with silicone rubber, which is a safe material that offers countless advantageous properties such as thermal stability, low chemical reaction, and low toxicity. Staying lit for a full a 20 minutes after its light source has been turned off, the fluorescent NUMEN literally falls asleep with you.