StrongHold PCMB-13 Pre-Printed Wire Marker Books are conveniently pocket-sized and contain wire labels printed on vinyl cloth. Markers are durable enough for up to 5 years and are designed to withstand various outdoor environments. They can also be torn in half to label each end of the conductor. Legend: +,-,AC,DC,PNG,NEUT,Blank, 21/45 markers per legend, and 12 pages per book.