ZAGG has announced the launch of its invisibleShield clear protectors for the fourth-generation iPod nano and second-generation iPod touch. All invisibleShields are made from aviation-inspired, scratch-resistant clear urethane film, and carry a lifetime guarantee. For the iPod touch 2G, the invisibleShield will be available as a front/screen protector only for $15 or as a $25 full body coverage set, with both the front protector and a back shield, which is specially-cut to protect the device’s shiny, scratch-susceptible metal back and sides. Likewise, invisibleShield for iPod nano 4G will be available as a screen cover only for $12 or as a full body set for $25. Both are available now.