Product dimensions for the Small Plug: 2.72 inches by 1.26 inches by 1.26 inches. Medium Plug: 3.15 inches by 1.34 inches by 1.34 inches. Large Plug: 3.74 inches by 1.61 inches by 1.61 inches. 

Product is made with Aluminum. This dazzling trainer kit includes three chrome plated plugs in graduated sizes, shaped for effortless penetration. Ideal for training solo or with a partner, these are body safe