No tool needed. Fits over the original headband and zip up in place. Don't need to remove the original headband. Can be used to cover your wear out headband or protect it from scratch. This product is compatible with Sony WHCH710N, WHCH700N, WH1000XM4, WH1000XM3, WH1000XM2, WH-XB900N, WH-H900N, WH-XB910N, XB950B1, XB950N1, MDRXB950BT, MDRXB950BT/B, MDRXB950BT/L, MDRXB950BT/R, MDRXB650BT, MDRXB650BT/B, MDRXB650BT/L, MDRXB650BT/R, MDR1000X, MDR100ABN, MDR100AAP MDR100A and other same size headband Product Dimensions: 5.11 x 3.1 inches (13 x 8 cm), Color: Black Package Contents: Headphone headband x 1