The Doublestuff is the 303F (fine grit) and the 303M (medium grit) bonded together to create a tool with a variety of sharpening options. Use dry, without oil, water or lubricants and clean with a plastic scouring pad and powdered abrasive cleanser. This pocket stone is packaged in a leather carrying case. Made in the USA.
Specifications:

Type	Sharpening Stone
Open Length	5"
Sheath	Leather
Handle Description	N/A
Sharpener Material	Ceramic Stone
Sharpener Type	Medium, Fine
Closed Length
	5"
	Ceramic Stone
	Medium and Fine Grit