CHEW GRENADE, Beef Flavored, Small 3-1/2" by Phydeaux Ent. / Bite-A-Bone Products [phy-i1] SERGEANT SPIKE'S CHEW GRENADE, Beef Flavored, Small 3-1/2", SuperFlex Material for Smaller Dogs. Extra strong and thick to hold. Hole in center for treats or peanut butter. Lots of bumps and ridges for extra fun chewing. Price: $7.30