Long-lasting & healthy: Made from 100% natural beef skin. These treats last 20% longer than bully sticks of the same size. Support positive chewing while providing dogs with plenty of collagen to support flexibility, mobility, dental health, a bright coat, and digestive health. Our 6 Inch Collagen Sticks are ideal for medium and heavy chewers. Free of hormones, chemicals, additives, and preservatives make Collagen Sticks an excellent alternative to rawhide.