Packaging

Aside from the mouse, one finds a braided charging cable (USB Type-A to Micro-USB), rubber extension cable (USB Type-A to Micro-USB), wireless dongle, quick start guide, plastic stick, brush, set of grip tape, sticker, replacement battery (300 mAh capacity), and two sets of replacement feet inside the box.

Weight

My scale shows around 26 g (+/- 1 g), which is exactly in line with the weight cited by G-Wolves. The HSK Pro 4K weighs just 2 g more than the Zaunkoenig M2K, which is wired and a bit larger. An outstanding weight.

Cable

The HSK Pro 4K comes with a paracord-like, braided charging cable (USB Type-A to Micro-USB) along with a rubber extension cable (USB Type-A to Micro-USB). Functionally, the cables can be used interchangeably for either purpose, but having two cables enables one to charge the mouse without having to disconnect the dongle first. The rubber cable has stronger shielding and thus should be used preferentially for connecting the dongle. On either cable, the connector has two horizontal notches that slot into the shell for further stabilization. Since the notches are present on the connector instead of the mouse, using a third-party Micro-USB cable is perfectly possible. Neither cable is particularly flexible, although the braided one wins in this department, albeit too fails to be flexible enough to fully allow playing while charging without feeling overly restricted. The measured length of the braided cable is 1.80 m, whereas the rubber one measures 0.90 m.

Feet

The feet on the HSK Pro 4K are white-dyed pure PTFE (Teflon) feet. They are of average thickness and have slightly rounded edges. Glide is very good. Since the bottom shell lacks indents for the feet, replacement feet of virtually any size and shape can be used, and several such sets are included in the box already. While a sensor ring is not installed by default, one is included with the replacement sets.