ITEM DESCRIPTION: 5 Shift Drums for various 50-125cc Honda Chinese horizontal engines. Use the pull down menu to choose the one you need. Compare carefully to be sure you order the correct one. E380: This is a "circulating gear" or rotary shift drum. Lets you shift constantly in one direction...so shift up to 4th gear, next up-shift and your in 1st again. Needless to say...these suck! Only use this if that's what you already have. It may be possible to convert this to a normal shift pattern. E379 E402: These are for 3 Speed Plus Reverse transmissions. NOTE: E379 has been replaced by E402 (they are identical except for the guide washer behind the shift star). It's best to use the guide washer but if you need to remove it, you can do so easily. E381 E382: These are for 4 speed 1 down 3 up transmissions. The only difference between them is, E381 has a guide washer for the shift mechanism E382 does not. These are interchangeable. NOTE: I'm sold out of E381.. you can use E382 (if you want a guide washer you can take it from your old drum).