Stainless Steel Ribbed Urethral Probe from Rouge Garments. Stainless steel ribbed urethral plug has a smooth ribbed shaft for intense stimulation. Ring pull at the top for easy removal. Has a whole through the ribbed shaft for easy ejaculation and urinate. Material : Stainless steel. Color Silver. Use water base lubricant. Size 6cm by .8cm e or approximately 2.36 inches by .31 inch.