Product material: silver plated， glowing material ， alloy Product specifications: 3CM Product weight: about 10g (for reference only) After the initial charge the glow dims slightly but afterwards it will continue to glow for a really long time. The best way to charge these up is through a mini UV torch. The charm is made of alloy. Measurement chain: 60cm Handmade time: 1-2 days( time from payment to shipment) The article will be sent to you in a nice bag of jewelry that is the perfect gift to give or to save this piece. Your jewelry is a special handmade piece so please take care accordingly and enjoy! pls contact us freely for further informations，thanks!