4ga Copper Wiring with Copper Lugs. 
 
Battery Wiring for use with the following:
 
1) Control Box to RV Control Center 12V
2) To Auxillary Battery
 
Lengths available in the following sections:
 
(25ft red + 25ft black) 
(50ft red + 50ft black)
 
Wiring comes pre-terminated on both ends with Battery Lugs (1/4" diameter hole).