80 nonwoven fabric strips absorb 6 times their weight in water. Absorbent strips are made of 50% cotton, 42% rayon and 8% polyester. Mop head is durable and machine washable and dryable. Exclusive sliding wring-locking mechanism makes refill attachment easy. Refer to Model No. 135706 (SKU 619191) for Light and Thirsty wet mop refill.