Those suck because they break too easily. Get these: Handmaster Plus 3 Piece Physical Therapy Hand Exerciser (Colours May Vary) https://www.amazon.com/dp/B00CTG3TQU/ref=cm_sw_r_cp_api_i_JpGtCbQH4KGJM

They are better since they work out opening and closing. I use them for physical therapy for synovitis.