Read the reviews, this is the best ferrule file on the market for sharpening your carbide tip ferrules. The extra coarse 80 grit large size of 6.75"x 3" means speedy sharpening, with long life and more surface area for filing taking big swipes. Extremely durable coarse diamond surface means the serious rollerskier can get a couple years of usage out of this. Use this for about 10 seconds on each ferrule before going out to ensure your tips are sharp. You'll never go back to a small file after using this one! Video overview: https://youtu.be/ZzQqKL3fAP8

Large size of 6.75"x3". 0.1" thick. 

Back side is smooth

Weight: 3.8 oz / 108 grams

Ferrule in picture is for size comparison only. Ferrules sold separately.