I tested these myself. They aren't just washers you can buy at the hardware store - they're different - much thinner. and they really do work!!! No bending or distortion, just perfect circles. I bought the recommended starch from Amazon and used an inexpensive, old paintbrush I found in the cupboard. You can also use a glue stick, Roxanne's Glue Baste It, or Elmer's School Glue. Applipops create perfect turned-edge fabric circles in 90 seconds or less! They make perfect circles every time, are easy-to-use, are made by quilters for quilters, and are proudly made in the USA. The Pro Pack makes eight different circle sizes: 0.375”, 0.5”, 0.75”, 1”, 1.25”, 1.5”, 1.75”, 2”.This professional-grade kit includes precision tools that make appliqué work a breeze, ensuring clean edges and perfect circles every time. Ideal for both hobbyists and seasoned professionals, the pack features a variety of sizes to cater to all your creative needs. Whether you're working on a small project or a large quilt, this pack is your go-to for achieving flawless results. Precision tools for appliqué work Ensures clean edges and perfect circles Suitable for hobbyists and professionals Variety of sizes included Vibrant yellow packaging with white text and graphics Made of: Metal Size: 3/8in to 2in