Pro-Sil Choose from either the large 17g (3 month supply) or small 4.25g sticks.(4-6 weeks) Our small stick is about the size of a standard lip balm stick, while the larger one is about 4 inches in length, and 3/4 inch in width. Both fit comfortably in a purse or hand bag. How Does it Work? Scars need an ideal healing environment, meaning the appropriate balance of moisture and maximum exposure to oxygen. Similar to Xeragel, Pro-Sil is a fully-encapsulating gel formula it completely covers the scar treatment site for uniform treatment of the entire site. Although the entire site is covered, Pro-Sil is semipermeable when cured, allowing oxygen to enter while keeping excess moisture out the ideal environment for healing scar tissue.