Packaging

Aside from the mouse, one finds a braided charging cable (USB Type-A to Type-C), wireless dongle, quick start guide, sticker, set of grip tape, and set of replacement feet inside the box.

Weight

My scale shows around 66 g (+/- 1 g), which is almost exactly in line with the weight cited by Darmoshark. For comparison, the regular (non-4K) M3 weighs 55 g while featuring a smaller battery, while the in terms of size comparable LAMZU Atlantis 4K weighs 55 g, likewise featuring a much smaller battery and not a full bottom plate. A very good weight.

Cable

The M3 4K comes with a paracord-like, braided charging cable (USB Type-A to Type-C). In terms of flexibility, this one is above average, to where playing while charging is possible without feeling overly restricted. Its measured length is 2 m, and a ferrite bead is attached.

The charging cable also functions as an extension cable for connecting the wireless dongle. On the underside of the mouse, a storage compartment for a dongle is present, which is curious in that the M3 4K does not include a dongle that would fit in there.

Feet

The feet on the M3 4K are white-dyed pure PTFE (Teflon) feet with slightly rounded edges. Glide is very good, but it appears that either the base isn't entirely flat or the application imperfect, as some scratchiness can be experienced on certain parts of the mouse pad. Thickness is average. The ring around the sensor ensures CPI stays consistent upon applying vertical pressure. A set of replacement feet is included in the box.