What's Included in the Kit: 1X 13" Diameter Concrete Barbell Weight Caster (suitable for making 25-45 pounds discs by filling the concrete to different levels in the same mold) - Concrete needs to have a thickness of at least 2 inches to be durable so we recommend nothing lighter than a 25 pound weight. - For accurate & precise weights, put the mold on a scale as you add the mixed concrete to it rather than filling it to a certain level 1X Detailed Instructional Manual 6X PVC Pipes suitable for 1" standard barbell diameter 6X PVC Pipes suitable for 2" Olympic barbell diameter 1 Bag of Concrete Fibers (Correct amounts for 2X 45lbs, 35lbs & 25lbs weights, creating a 210 lbs exercise weight set) Concrete & Silicone Lubricant Spray are not included. Mold Material: Thick, heavy duty plastic This gym equipment for home weight lifting is suitable for beginners to professional weight competitors. Gravity weights are a fun bonding project for the weekend with friends or family - similar to DIY atlas balls, casting big, round weights has never been so easy! Detailed Instructions included in the kit but a Quick Start Guide to get your hear around the process: - Use silicone lubricant/cooking spray on the mold to aid the de molding process & hot glue the PVC pipe (collar) over corresponding centering ring provided inside the mold - Trowel in mixed concrete (with fibers) into the mold over a set of scales to accurately determine your plate's weight as you go - Carefully demold after 24-48 hours & repeat with your second weight plate (if you're impatient we recommend ordering two kits in order to create 2 plates at the same time. Pro tip: Turn your weights into rubber like bumper plates, simply spray with truck bed liner when full strength is achieved after 28 days of curing. You have the ability to fully customize your weight sets for home gym weightlifting with colors, sizes & initials!