What are the dimensions and weight of the StarTech.com MST14DP123DP hub?

The dimensions of the StarTech.com MST14DP123DP hub are 0.55" x 4.13" x 1.69", and it weighs 0.12 lbs.

What is the maximum resolution supported by this DisplayPort MST hub?

The maximum resolution supported by this DisplayPort MST hub is 7680x4320 (8K) on a single monitor or 4K on all three displays.

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StarTech.com MST14DP123DP 3 Port DisplayPort MST Hub - 3 x 4K - DP 1.4 Multi Monitor Splitter for Windows - HDR - EDID (MST14DP123DP)

Maximize productivity by connecting 3 DisplayPort monitors to your Windows computer using this Multi-Stream Transport (MST) hub
Experience cutting-edge quality w/ support for UHD video resolutions up to 8K (on a single monitor) or 4K on multiple displays
Optimize your visual experience w/ next gen splitter technology
This DP 1.4 MST hub supports HDR for expanded contrast ratio and color accuracy - A multi-monitor daisy chain solution that’s more cost-effective than traditional docks