Select Elk Antler Dog Chew. An antler your pup will love! These Barkworthies antlers are made with grade-A naturally shed elk antlers from the Colorado Mountains and are filled with soft marrow that contains zinc calcium manganese and iron. Highly durable this antler will give your pup hours of chewing time while also keeping their teeth nice and clean! We suggest that you supervise while your dog enjoys any chew treat. Sizing*: <b>S</b>: 4.25 in. <b>M</b>: 5.75 in. <b>L</b>: 6.5 in. <i>*Like all natural products there is some degree of size variation.</i>