Why do some personal self-retracting lanyards (SRLs) have a separate shock absorber?

Personal SRL devices most often incorporate a separate or external tear-tape energy absorber instead of an internal rotary brake because they are smaller and have restrictions on size and weight. Internal rotary brakes are heavy and complicate the use of personal SRL devices, especially when considering the need for a reserve line. 

Safewaze external energy absorbers allow for easy use of personal SRL devices while maintaining high-capacity energy absorption.

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