Cisco SM-SRE-710-K9 1-Port GbE & 1-Port USB Service Module (J698)

Cisco SM-SRE-910-K9 1TB HDD 4GB RAM 1Gig Control Processor Module for Cisco 3900

Cisco SM-SRE-710-K9 Services-Ready Engine 4GB RAM 500GB SATA

CISCO SM-SRE-910-K9 Service Engine Module with 4GB RAM w/2x 500GB HDD SM SRE 910

Cisco SM-SRE-900-K9 4GB RAM Service Module For Cisco 3900

Cisco SM-SRE-900-K9 Services Ready Engine (SRE) 900 Service Module

Cisco ASA SSM-20 Security Service Module RJ45 ASA-SSM-AIP-20-K9 V03 256MB Flash

Cisco SM-SRE-710-K9 4GB DRAM 2G flash 500GB 5400 rpm SATA Hard Disk Replaceable