These are Contemporary Modern Style Chrome Finished Mini Button Sealed Tuning Machines For Four Five String Bass Guitar Available in Seven configurations for Right Handed or Left Handed Bass: MSM MBTCR2R2L - Two Right Hand Two Left Hand for Right or Left Handed Four String Bass MSM MBTCR4ILR - Four Right Hand for Right Handed Four String Bass MSM MBTCR4ILL - Four Left Hand for Left Handed Four String Bass MSM MBTCR3R2L - Three Right Hand Two Left Hand for Right Handed Five String Bass MSM MBTCR3L2R - Three Left Hand Two Right Hand for Left Handed Five String Bass MSM MBTCR4R1L - Four Right Hand One Left Hand for Right Handed Five String Bass MSM MBTCR4L1R - Four Left Hand One Right Hand for Left Handed Five String Bass. The sets include Crome Finished Tuning Machines, Ferrules, and Mounting Screws. The Gear Ratio is 19 : 1. FREE Shipping within the 48 States of the continental USA. WE SHIP WORLDWIDE. Buyers outside the 48 States of the continental USA please request a shipping quote prior to ordering.