Phthalates free materials Dong Thermoplastic Rubber TPR, Harness Tricot and Polyurethane PU, Rings Metal. Sizes one size fits most. Fits up to 60 inches waist. Dong overall length 8.5 inches, insertion length 6.5 inches, width 1.75 inches, circumference 5.5 inches. Ring diameter 50mm, large ring diameter 64mm e or approximately 1.96 inches, 2.51 inches.