SPIN MOP REPLACEMENT HEADS: Made from 100% super soft absorbent microfiber strands; Absorbent strings that will not scratch floor surfaces and it removes tough dirt and grime for a steak-free clean, this mop refill is ideal for use in mopping all hard floor surface without scratching. 10 PACK MOP REPLACE HEAD: The soft and flexible mop replacement heads are perfect exact fit for triangle spin mop system for Easy Wring 1 Tank. Inner triangular rim size 3.9" and the outer triangular rim size 5.7" in diameter.