Shimano SL-TZ20 Bike 3x6 Speed Thumb Shifters Lever Model: Shimano SL-TZ20 SL-TZ20 handlebar mount thumb shift levers for multi-speed bikes. Shimano TZ20 ensures smooth and trouble-free indexed (SIS) shifting. Easy to install and adjust, work great There is 100% new and high quality, no original package.