Torbot Colly-Seel™ Disc 3-1/2" OD Round, 1/2" Starter Hole, Blue, Thick Colly-Seel™ Discs are made with healing Karaya which helps to clear irritated skin. They are easy to use, comfortable to wear and non-medicated. These protective barriers are used as an alternative to adhesives. Helps maintain peristomal pH levels. Custom opening sizes are available by special order. 1/2" Starter Hole.