SRD:Scabbard of Keen Edges

Scabbard of Keen Edges: This scabbard is fashioned from cured leather and fine silver. It can shrink or enlarge to accommodate any knife, dagger, sword, or similar weapon up to and including a greatsword. Up to three times per day on command, the scabbard casts keen edge on any blade placed within it.

Faint transmutation; CL 5th; Craft Wondrous Item, keen edge; Price 16,000 gp;Weight 1 lb.