Our FC multimode mating sleeves have phos. bronze sleeves and metal housings. Our APC mating sleeves have zirconia sleeves and metal housings. Also available is a singlemode/multimode mating sleeve with a 2 style metal housing and zirconia sleeve. Our APC mating sleeves are available with zirconia sleeves and either a 4 style or 2 style metal housing. In addition to this particular style mating sleeve, we can provide mating sleeves, adapters, adapter panels and connectors for all your needs and applications. Hybrid mating sleeves are also available. If you don?t see the item that you need on our website, chances are that we have the item in our large in stock inventory.