1.Material:polyurethane 2.Dia:4cm,5cm,6.3cm,7cm,9cm 3.Color:any color available 4.Logo imprint available 5.OEM welcome When you feel stressful,unhappy.You could do anything to it,squeeze it,throw it...No resistance,totally safe.I promise.pu ball material is flexible polyurethane.non-toxic,no harmful,soft and save.OEM design is welcome.