Here's a link on what I'm talking about, http://www.ebay.com/itm/Black-Pair-...526&pid=100011&prg=1005&rk=3&sd=200812779804& The reason why I asked this is because in the description it doesn't say if it's 4 wired but it is for jazz guitar which is what I'm looking for. I don't understand what is meant by 4 wires, do all pickups especially for jazz bass guitars have four? Or do I have to search in a different category? This is the person that recommended it to me, "This will give you six pickup tones from your current instrument. However, the big advantage is that if you decide to have someone install a 4-wire humbucker pickup in the neck area of your Jazz Bass, you can take advantage of this increased number of pickup coils by installing our T4-Switch. This added pickup+switch combination will give you a Jazz Bass with 76 pickup tones that other bass players will be ing over. " Here's a link to this exclusive product ==> http://www.awesome-guitars.com/1-products-39.htm The previous product is an upgraded pickup knob and tone control which I wold require a total of four pickups in my bass guitar ;P your help will be greatly appreciated, thank you for your help!