Brand: Antigravity Batteries
These special clamp-on jumper cables are designed specifically for the Antigravity Micro-Start XP-1, XP-3, and XP-5 made after 2016. The style is identified by the connector posts that plug into the Micro-Start: This version has a one-piece plug, with no gap between the connector posts. The plug is D-shaped, with one flat edge.
The clamps for older Micro-Starts (2016 and earlier) had a plug with two separate posts with an air gap of about 1/16" (2mm) between them.