CHEW GRENADE, Beef Flavored, Large 5" by Phydeaux Ent. / Bite-A-Bone Products [phy-i3] SERGEANT SPIKE'S CHEW GRENADE, Beef Flavored, Large 5", Extra Tuff Material for Large Aggressive Breeds. Extra strong and thick to hold. Hole in center for treats or peanut butter. Lots of bumps and ridges for extra fun chewing. Price: $12.98