Enjoy the unique orgasmic sensation of blended internal and external penis pleasure. A beginner-friendly version of metal designs, this silicone penis plug and glans stretches and flexes for the best fit, and can engorge your erection and prolong play. The insertable plug measures 4. 8mm diameter at its slimmest, and 7. 7mm at its widest. Top tip: Always use a good quality sterile water-based lubricant when inserting anything into your urethra.