Step into another world with the Sinister Eye Metal Butt Plug set! When you get the set, you can explore three realms of pleasure by training your backdoor to endure bigger and bigger sizes! These fantasy-themed metal plugs showcase a mesmerizing glass eye that peers out for a thrilling visual. Made from nickel-free metal, the plug is designed for sensitive skin and is compatible with all lubricant types. With a safety-first design that includes a small neck, flanged base, and tapered tip, it ensures comfort and ease of use. Spice things up by heating or cooling the plug with water to add an exciting temperature sensation to your intimate moments! Measurements: Overall length: 2.9 inches. Insertable length: 1.5 inches. Widest insertable diameter: 1.1 inches. Medium: Overall length: 3.3 inches. Insertable length: 2.9 inches. Widest insertable diameter: 1.3 inches. Large: Overall length: 3.8 inches. Insertable length: 3.4 inches. Widest insertable diameter: 1.5 inches. Materials: Metal, glass.