Max Size Gel - 5 Oz Tube/ 148mlMax Size Gel is a male enhancement topical formula that provides a unique transdermal delivery system for quick absorption and immediate results. Max Size Gel is the only topical male enhance product with Butea Superba, a well documented and patented natural PDE 5 inhibitor which helps essentially "lock in" the enzzyme responsible for enhancing erectile response. This natural herb is only now coming to the U. S. after years of research in Thailand.