Adam and Eve Glass Anal Training Trio from Evolved Novelties. Perfect for backdoor training and retraining! For those new to anal play or experienced pros graduating glass plugs make it easy! Work pelvic floor muscles for better control, strength and endurance during sex. Start small, move to medium, then take on large with sensual ease! Warm or chill plugs for even more thrills. Non-allergic, non-porous, hygienically superior. Use with any of your favorite lubes, easy to clean. Material: Made from durable, tempered Borosilicate glass. Features: 3 different sized anal plugs. Small butt plug size 4.55 inches by 1.15 inches, medium butt plug size 5 inches by 1.35 inches, large butt plug 5.75 inches by 1.5 inches. 5 year warranty