1, your waist circumference. 2, your chest circumference. 3, your thigh circumference. 4, your wrist circumference. 100% Stainless Steel + Silicone liner, High Quality Handmade & Mirror Polished. Collar:perimeter 38-40cm (customizable size) 2 Bra :A-D 3. Wrist Ring perimeter 24-26cm (customizable size) 4. Handcuffs perimeter 22-24cm (customizable size) 5. Waist Size: 60-68cm; 68-76cm; 76-84cm; 84-92cm; 92-100cm; 100-108cm; 108-116cm. Please choose the right size according to your waistline. Thigh cuff perimeter 54-56cm (customizable size) 7. Thigh cuff perimeter 50-52cm (customizable size) 8. Thigh cuff perimeter 40-42cm (customizable size). Ankle Cuff perimeter 28-30cm (customizable size).