1.5" x 1.5" x .25" heart shape key ring, pendant, back pack accessory. This Heart looks yellow in the light and glows green in the dark. This item is made form non toxic materials and comes on a 4" chain that can easily attach to all your gear. Share the gift of love with this perfect gift for everyone (don't forget Valentine's Day). This heart will recharge over and over again when exposed to natural or artificial light.