This prusik is designed for those who run an openable bridge and want the added benefits of adjusting the angle in which the saddle pulls when using a fixed bridge.  These come standard in all our openable bridge kits and we sell this also as a separate item in which you can add to an existing open style bridge or diy your own.  This prusik also has a fixed eye built into it which allows for a fixed connection point for your carabiner.  Weighs a shocking 0.6 oz!!
 
How to Install your Secondary Fixed Eye Prusik