Versatile plastic wire wrapping mandrel Unique shapes and a Variety of Sizes Triangle, Square, Circle, Oval Shapes48 Sizes Create uniform and consistent loops in your wire work in fancy shapes This Mandrel is sturdy plastic and lightweight, easy to use! Make round loops in 12 different sizes, oval loops in 12 sizes, square loops in 12 sizes and triangle loops in 12 sizes.After forming a shape, be sure to harden it using a Wire Whacker or Plastic Hammer and Bench Block.We always recommend wearing protective eye-wear when working with tools.Each mandrel is 21cm total length.Instruction sheet is included with each mandrel.