Ring Writer Clip (Set of 3) (1S 1M 1L) Tens Units Removable strap to adjust compression Jobst Ultrasheer 30 40 ThighHi Removable strap to adjust compression level Automatic age based target zone : bpm % * To help you train safely and effectively the training computer determines your heart rate target zone limits automatically according to your age based maximum heart rate (220 minus age) 41 cm) Medium 61 cm) ID * Implement is automatically positioned and angled correctly for use * Little or no gripping ability is needed * Can be used with pens pencils crayons paint brushes tooth brushes razors etc * Three sizes to fit different fingers: Small