Shape
The shape of the Venator is in the medium range, similar to mice like the Zowie FK2, Rival 100, or Abyssus. It lies very safely in the hand because of the sides' convex shape and texture of the plastic.
Weight: 80 g
Height: ~40 mm
Width: ~60 mm
Width at grip area: ~54 mm
Length: ~122 mm
Number of buttons: 6
Above, you can see how I hold the mouse. Despite its relatively small shape, I could grip the mouse comfortably. The indentations on the sides helped by allowing my fingers to curl up to the shape of the mouse.
Comparison
In this segment, I place the Venator next to some popular mice for a direct comparison to those. This will hopefully give you a better picture of its actual size.
Logitech G-Pro - Ninox Venator - Zowie AM-FG - Nixeus Revel
Ninox Venator - Zowie AM-FG
Ninox Venator - Nixeus Revel
Ninox Venator - Logitech G Pro
Ninox Venator - Ninox Aurora
Steelseries Rival 100 - Ninox Venator - Razer Abyssus 3.5G
Ninox Venator - Razer Diamondback
Logitech G900 - Ninox Venator - Logitech G403
Zowie FK2 - Ninox Venator - Zowie ZA12
Actual Weight
The weight on my scale is exactly as advertised, sitting at 80 g. This means the Venator is the lightest 3360 mouse so far, something I can highly appreciate.
Here are pictures of how much each individual component weighs: