B4 Black

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Game smoother with the B4. Xtrfy’s patented mouse bungee design is made to be both steadier and more flexible – all to help gamers improve their play. Available in Black, White, Pink, Miami Blue, and Retro. The B4 comes in all five colorways of Project 4, making it easy to combine with your M4 mouse and K4 keyboard, and build the perfect setup.


Flexible Arm
Using a flexible silicone arm instead of the conventional metal spring design, the B4 is designed to follow every swipe without resistance and give you an unmatched wireless feel.

Steady Base
While the arm of the bungee needs to be flexible, the base has to be immovable. Anyone who has had a mouse bungee move or fall over in an intense moment of the game knows the importance of having a low centre of gravity. The B4 is engineered to stay put.

Quick Assembly
Detach the silicone arm for extra durability when you’re on the go. And set the bungee up quick and easy when it’s game time. Put the silicone arm in the base, slide the mouse cord into the groove of the arm and the clip at the back. You’re ready in ten seconds. (If you’re slow.)

Compact Design
Designed to hit the sweet spot between a small footprint and a stable construction, the B4 is minimalistic on your desk and compact in your bag. Or your pocket.


Weight 265g
Height 130mm height (includes arm)
Width 80mm
Depth 80mm
Base Height 19mm

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