Viala Chrome File T106N W16 connecting to any Bluetooth enabled 402431500998 connecting to any Bluetooth enabled device and compatible with any helmet with an audio enabled liner Best applied the night before and buffed into the ski with a soft cloth or preferably the Swix F4 Combi Brush the next morning before riding or used as needed when out riding The Swix Viala File a traditional ski file is ideal as an all purpose file for the amateur tuner The Viala File should be used as an allround file for detuning edges and removing burrs and can also be used in conjunction with any of the Swix racing file guides or adjustable base file guide