SKYZONAL Ergonomic Adjustable Armrest Wrist Rest-Only Adjustable for Chair (Please Confirm Our Straps Size Before Ordering) Perfect Arm Support While Working on Your Computer At Home or Work. Easy assembly, no tools necessary. For chair use only!!! Keep correct posture, avoid cervical vertebrae ache, mouse hand & nearsightedness SkyzonalTM is a US registered trademark protected by the US Trademark Law.