单子item 3M Safety-Walk Light Duty Tread, White, 2-Inch-by-60-Foot qty: 1 unit price: $46.75 (希望有更便宜的，没去查） link: http://www.amazon.com/gp/product/B000Y0ZXDK/ref=ox_sc_act_title_3?ie=UTF8&psc=1&smid=ATVPDKIKX0DER 电话有的