It is made of special blend of silicone and Thermoplastic Rubber TPR called Perfect Fit Blend. It is safe with all lubes. Wash thoroughly with mild soap and water. This product is not compatible with latex. Perfect Fit Brand Products are sold, and intended for use strictly as adult novelty toys for entertainment. They are not intended for medical use and have not been clinically tested. No medical claims are warranted or implied by the use of these products. Dimensions for Medium size double tunnel plug 3.5 inches insertion length by 6.9 inches in circumference. The Double Tunnel Plug Ice Clear Medium from Perfect Fit Brands.