The Boss is made of SilaSkin, which is a perfect mix of Silicone and TPR which gives it an unbelievable stretch factor. The widest external diameter is 2.5” and the full length is 6.5” which stretches to fit most guys of any shape and size. The Boss is safe with water based lubes. Wash thoroughly with mild soap and water. Remember, this is not a contraceptive or a substitute for a condom. This product is not compatible with latex products.