Sporn® Durable Marrow™ Chew Bones are the chewable nylon bones with "Jerky Flavor Down the Middle!" Perfect for strong chewers, nylon shavings act like a toothbrush and help remove tartar from the dog's teeth. Unlike traditional rawhide bones, this bone will last!

X-Small:  Recommended for dogs under 10 pounds (.75" x 3.5") 
Small:  Recommended for dogs between 10-25 pounds (1" x 4")
Medium:  Recommended for dogs between 25-40 pounds (1" x 5")
Large:  Recommended for dogs between 40-80 pounds (1" x 7.5")
X-Large:  Recommended for dogs over 80 pounds (1.5" x 9")