Yellow and Black Bump HFA2548321: 1. Elongation at break: 212%. 2. Siu A hardness: A77. 3. Tensile strength: 6.1Mp. Yellow and Black Bump HFA2548321:Elongation at break: 212%.Siu A hardness: A77.Tensile strength: 6.1Mp.The impact of flexibility: 37%. Yellow and Black Bump HFA2548321