Each side (front and back) is made of two thin layers of Hermann Oak (about 4oz) contact cemented together. The inside and outside of the holster is smooth (grain side) leather.
I made my own pattern. I should have posted the four rough draft holsters I made before this one. They show the progression from rough to more refined. I also needed them to dial in the the stitch line around the gun. After the first draft I decided to show off the top of the cylinder; to me those elongated cuts are distinctive to Colt double actions. I think the cylinder cuts look great, and I don't think lowering the cylinder area of the mouth really exposes the gun too much to getting scratched and what not. It was a fun holster to design and make as it is for my dad, and I really liked the gun too.