What's a cam? If your not sure ...Click here.  The first of 4 numbers in the family hierarchy represent the location of manufacture and manner of distribution. A "2" or "3" means it is hand milled through the USA custom shop. Sold only through Kahler International Inc., it is stamped Kahler "Made in USA". It is known as the "Professional" version. A "4" means it was factory made in China under exact SAE specs for Kahler and is primarily a lower price point trem for a guitar manufacturer to use. Stamped the "X-Trem", they are not sold thru retailers. A "7" means it was factory made in the USA and is the retail version most players will see. It is stamped Kahler "USA Hybrid"... Hybrid because it incorporates a locking screw to lock it into a fixed bridge. It's a full trem and a fixed bridge in one.

The second number represents the type. Stud mounts are "2", Flat mounts are "3" and Bass bridges have a "4".

The third and fourth number can represent metal configurations or number of saddles....

For fixed bass: The third number followed by a 0, represents the number of saddles. For example, a five string fixed bass bridge is 7450. A four string would be 7440 ect. There are 2 Cam/Saddle combinations for the 7 and 8 string guitar models. The third number in those models represent the metal combination Brass/Steel "1" or Brass/Brass "2".

For 6 string guitars starting with "2", the third number in combination with the fourth, represents the Cam/Saddle metal configuration. There are 4 Cam/Roller configurations possible on 6 string handmade guitar tremolos starting with a "2". They are: Steel/Steel "00", Aluminum/Brass "10", Brass/Steel "15", Brass/Brass "20", The fixed guitar bridges (3300 and 7330) use a uni-body with brass rollers "00" & "30". Hybrids and X-Trems have a "00" for end numbers only. They come with wide spec cams and brass rollers.

Generally, The fourth number refers to the number of strings on the trem. "0" for six strings on the guitar, "5" - "6" for five and six string bass models, "7" - "8" for seven and eight string bass and guitar models. There are 2 Cam/Saddle combinations for the 7 and 8 string models, the fourth number dictates the number of strings.

Regarding the old discontinued Fulcrum line..

All start with a 2. The "Traditional" line was a 2 followed by a 5. It had 2 versions, a steel roller "00" and a brass roller "20"), hence the 2 models 2500 and 2520. The next was the 27xx series made up of 3 models with no brass or steel choices. The "2700 Series" was the first of the series. It was stamped "2700 Series" but was really called the 2710 "Killer". The next was the 2720 "Spyder" followed by the 2760 "Steeler". Some optional saddle choices for the Spyder created a couple of sub-series like the 2722 and the 2750 but these were rare.

They are all winners! Ask yourself, what do I want from my bridge? Looks? Tone? Feel? Adjustability? Adaptability? All the Kahlers have that equally now. But you can get specific tones and features from the Pro models because they are custom shop versions where you pick and choose your cams, saddles and colors. That's why there are the 4 models in the 22xx Series and 4 like models in the 23xx Series. In a nutshell ...Kahler Pros are signature models you specifically order, Hybrids are factory made in the USA for the masses, and sold thru retailers, while X-Trems are factory made in China for lower price point guitars.