Leads are used for the cable from the backpack

as seen in The Battle of Mare Smythii from "Mobile Suit Gundam: The Origin"

or you can reuse some of the many leftover parts from other models

Series:Gundam 00

Ultimate Guard Deck Case 100+ Standard Size Petrol Blue Gundam Sentinel Leads are used for theUltimate Guard's Deck Case 100+ is a durable deck box made from sturdy yet soft polypropylene that holds 100 double sleeved cards in Ultimate Guard sleeves* from trading card games like Magic: The Gathering, Pokmon, Lorcana, Flesh and Blood, Yu Gi Oh!, Riftbound, or One Piece. The securely self locking TCG deck box comes with a Card Divider in the matching color as well as a convenient two line label sticker. Deck Cases fit into all Ultimate Guard