One side of this two-in-one tool shapes the cue tip to the proper radius, 

The other side scuffs the cue tip to hold chalk and prevent miscues. 

Made of solid metal with silicon carbide, this device lasts and lasts. This product is used by professional players. 

The Cue Cube has a successful track record because it works so well and is reasonably priced.

Now available alone or with the handy keychain attachment