These are vintage style ashtray Telecaster bridges with a couple of modern amendments to make them more useable. They have the lip around the edge shortened where it commonly hinders the path of the picking hand. The saddles are also compensated.
The saddles are not cylindrical as were vintage Telecaster bridge saddles, but instead have a modern modification to aid with the common intonation issues. The saddles are made with sloped tops to ensure that each string sits approximately where it should do for accurate intonation. This means that intonation will no longer be a compromise between the two strings that share each saddle.
Brass is known, due to it's higher density than zinc, to provide more sustain, and thicker, more assertive tone. Suitable for through body or top loading.
Mounting hole spacing: 64.5mm center to center of outermost holes