Full size but opened and some used tube of Medik8 Crystal Retinol 20 Stable Retinol Night Serum Next Generation Vitamin A. This is an award winning product proven to reduce fine lines and wrinkles with a formula that is more gentle on the skin than many retinols can be. It goes from #1 and then to 3 to 6 to 10, etc... and 20 is at the top and the most potent . 1 is considered for beginners just starting a retinol treatment and 3 is next, so 6 and up is where it starts getting more. I started with 6 myself because I wanted something more potent and it did not irritate my skin at all and has been effective, so I was ready to go to the next level and that's why I am selling this one. The tube is I would say between a little over half full and a little goes a long way with this. It retails at $120+ so this is a great deal for the amount left in the tube.