The Number One STP is Number One Laboratories' original STP model.
Those familiar with Transthetic's EZP will recognize the style and shape of this STP packer, though this model comes at a 3rd of the price. Compared to the EZP, the Number One STP has a narrower bowl but a wider hole in the shaft. This wider hole allows for use without restricting your stream. The lower price tag makes this a great STP for beginners.
Check out Alexander Erin's Review:
MATERIAL: Number One Laboratory* STPs are made from Platinum Silicone with a soft powder finish. Every model sold is completely handmade using the best materials available and thoroughly checked for quality and durability.
CHOOSING A TONE: If you are not a person of color, we strongly encourage you to buy the "light" tone. Historically, white folks have generally been unhappy with the "medium" shade, which is similar in color to a light brown M&M.
*First-time users, we strongly recommend that you practice in the shower before attempting to use it in public. Even if you have had success with other STPs in the past, every STP is different and requires some getting used to.
*Please note that due to the sensitive nature of this product, all sales are final.