Up for sale are 15 pieces ALPS jog/shuttle SRGP type, including the two black plastic wheels (ring and center part) for jog and shuttle function, and three mounting screws. A data sheet is available here. They have been unsoldered from used equipment with broken electronics. I have not tested these units, but they should work. They are USED and most bear marks of usage, see the attached pictures - but none of them is in bad shape. The spring loaded mechanics feel very sturdy, no sluggishness w