Building Block Flash Drive

Building block design with stacking cap design, mini lanyard, Grade A memory, 10 Year warranty on data retention, 1 year replacement warranty on faulty manufacture. There are 3 styles 1) all smooth on the back non stackable 2) 1 sprocket on 1 half on the back 3) 2 sprockets on each half of the back. The sprockets enable the flash drives to be stacked.