White Nylon G-Glides with 2.25" elastic tabs which are sewn to the curtains. Used by Airstream to make their trailers and RV curtains since the 70's. Fits RECMAR 3108, 3110, 3290, 3292, 3294, 3296 Curtain Tracks. Also compatible with many other boat curtain tracks and RV curtain tracks. Airstream part # 700045. Available with snap for Galietti CST Curtain Snap Tape.