1.Ergonomic mouse arm rests for chair arm support mouse pad for chairs arm rest, Only Adjustable for Chair, Cannot be used on the desktop, Keep correct posture, avoid cervical vertebrae ache, mouse hand & nearsightedness,made of strong ABS plastic, ergonomic design for desk and chair, very easy to install. Magic straps make it easy to fasten to most sizes of chair armrest.2.Mouse holder for chair mouse extenders for office work /home mouse tray armrest extender pad for chair arm mouse support attachment, Maximum load: 10kg. Notes: 1.Perimeter of chair armrest can't bigger than 18cm (7 inch) 2.To prepar if the perimeter of chair armrest is bigger than 18cm (7 inch) 3.The length of our productis 29cm (11.5 inch),the length of LOOP is 15cm (5.9 inch)the length of HOOk is 14cm(5.5 inch) 4.Please measure befor purchase 3.Arm rest mouse pads with wrist rest ,Unique design ebow rest prevents mouse from sliding down, memory foam wrist rest protects your hand from hurt.4.Chair mouse pad mount ergonomic armrest extender mousepad for office/home, 3 lengthened reinforcing zip ties included, can be used to lengthen or reinforce. Outstanding design now makes you move freely, comfortably and effortlessly to perform your computer tasks.5.Arm support mouse platform for chair, Reduce Stress from cervical vertebrae, shoulder, arm and wrist; keep correct posture, avoid cervical vertebrae ache, mouse hand and nearsightedness