• To establish your personal mouse size, measure the length from the crease of your wrist to the end of your longest finger:
  Less than 17cm - Small
  17cm - 19cm - Medium
  19cm - 21cm - Large
  More than 21cm - Extra Large (Not available left handed)
• The Contour range is established as the definitive 'ergonomic' mouse offering a choice of sizes in both left and right-handed variants.
• Optical technology (no ball to get dirty)
• Tilted palm & elevated wrist support.
• FOUR programmable buttons plus thumb-wheel.
• USB and PS/2 connections.

Right hand medium and large available now contact customer services for other sizes.