AATCC Multifiber test fabric # 1 precut pieces of 2 X 4 inches (5 X 10 cm) WITH Heat Sealed (Fused) Edges. Six fiber (8 mm [0.33 in.] bands) containing acetate, cotton, nylon, silk, viscose and wool. Precisely Heat Sealed Edges to use in any mechanical action test such as AATCC TM 61- Colorfastness to Laundering testing done in a Laundrometer. Pack of 250 Pieces