This keychain is the popular change-a-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 faceted, green glass bead with a silvertone grommet. On either side of it is a silvertone bead, and at each end is a temperature sensitive bead, also with a silvertone grommet. They don't do a complete change of color, but they do show various shades of green and blue 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] 3-3/4". Your design-inspired Keychain will arrive gift-boxed, and shipping insurance is included in the shipping costs.