These nylon logbook covers are very light weight but cover and protect your logbook very effectively. The nylon material is extremely durable and is washable. The cover features a holder for two pens and a velcro pocket on the back for licenses, gas receipt, and other documents. The Medium Log Book Covers fits the Jeppensen Pilot Logbook (JA506048), the ASA Standard Logbook (ASA-SP-37) and the Stafford Pilot Flight Record and Logbook. The Large Log Book cover fits the Stafford Senior Pilot Flight Record and Logbook, Jeppesen Professional Logbook (JS50605) and the ASA Master Log (ASA-SP-6). Available in black, blue, or red.