The entire series is physically interchangeable and so this TCN2000 can be fitted on the Technicraft TC1000, TC3000 & TC4000 cartridges as well as of course the TC2000 Technicraft cartridge.
If you find this in grey plastic elsewhere on the internet it is a generic conical. We offer the only genuine Technicraft elliptical solution available anywhere that we know of as of press time. The Technicraft brand was a line marketed and manufactured by Audio Technica for a while.
TCN1000 = 0.7 mil conical @ 1.5 - 2.5 grams tracking (Yellow Plastic)TCN2000 = .4x.7 elliptical @ 1 - 2 grams tracking (orange plastic) TCN3000 = .3x.7 elliptical @ 1.0 - 1.75 grams tracking (red plastic)TCN4000 = Linear Contact Nude @ 0.75 - 1.75 grams tracking (nude/natural diamond, tapered cantilever)Note: All above needles are interchangeable.