This keychain is the popular changeable bead style: unscrew the bottom bead and you can replace the beads any time you want to. In the center of the silvertone charm is a round, amber-color acrylic bead, measuring 9mm in diameter. On either side of it is a Mirage Bead, that measures 16mm x 14mm, and is temperature sensitive. The brown beads don't do a complete change of color, but they do show various shades of green, blue, and purple in response to body heat when the keychain is being held. The length of the changeable bead style pendant is [approximately] 2-1/4". Total length of the keychain, including the clip, is [approximately] 4-3/4". Your design-inspired Keychain will arrive gift-boxed, and shipping insurance included in the shipping costs.