Package contains 4 pairs (male + female). There are 2 pairs in black and 2 pairs in red nylon sheaths.
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These big 6mm gold plated bullet connectors are rated to handle 150A continuous and 250A peak current. They can just barely accept 6-AWG stranded wire although it might be a tight fit if pre-tinned. The solder cup for Male & Female is nearly identical at about 5.3mm in diameter x 3.6mm deep. For larger wire we have the AS150 model available.
These are not cheap copied XT150 plugs. These original Nylon XT150 plugs, can handle over 150A current for extended periods without exceeding 80 Deg. Celsius thanks to their better contact surface area. The plug is also less likely to deform or melt in comparison to copied non-Nylon XT150 plugs.