This Open cup tool was carefully crafted by an Acrylic Pouring Artist for Acrylic Pouring Artists - 100% from the ground up and is copyright protected. While this product is thin and light. I ensured that it is durable, sturdy and functional, designed around my 6+ years of experience as an Acrylic Pouring Artist. This tool was created for use in Acrylic pouring for the open cup technique. It's fun to use, easy to clean and it's reusable, which saves a lot on waste. Check out this video as I use these myself https://youtu.be/6LHV4rknQrs?si=dXQl9xhDY6rWdpCt There are four different sizes included in this set. 2 inch, 2 1/2 inch, 3 inch and 4 inch. All four sizes are included in this purchase. Why did we choose PLA Filament to 3D print? We chose PLA primarily because its biodegradable. When its practical, we should all do a little to reduce our carbon footprint :) Also, because its strong and resists warping. Plus - you get to save some money by having a sturdy reusable Open Cup tool. PLA is not a perfect material and, just like every other plastic, has some disadvantages. The low melting temperature also means low-temperature resistance. Parts start to lose mechanical strength at temperatures over 60 °C. Never put these in the dishwasher or soak them in scalding hot water. We recommend that you only use Acrylic Paint in these cups and rinse/soak soon after a pour in cold to luke warm water for clean up. © COPYRIGHT PROTECTED! Tracie Reed Designs, INC 2021