O-ring is 3/4" solid brass

Highly adjustable for a superior fit and designed so it won't stretch

High visible reflective center

5 points of adjustment for size

Sprenger Pineapple Chew Toy et802 O-ring is 3/4" solid brassCan be filled with treats 7" tall by 3. 5" wide Versatile food grade rubber Dishwasher safe For large and medium breeds [split] The Herm Sprenger Pineapple Chew Toy is made from long lasting, food grade natural rubber. The textured surface is molded in the shape of a real pineapple with realistic grooves and cut outs. This toy is very versatile and can be filled with small treats to act as a treat dispenser motivating your dog to chew for a reward.