规格：
1、"SDC" Non-Woven Felt Discs, 140mm diameter x 3mm thick, box of 24 pcs
"英国SDC企业" 耐磨羊毛非织物衬垫用于马丁代尔，直径140mm及厚3.0mm(每盒有24块)
(750 +/-50g/m2, approx. 3 +/- 0.5mm thick)
符合标准：BS5690-1988, M&S P19
2、"SDC" Non-Woven Felt Discs, 90mm diameter x 3mm thick, box of 24 pcs
"英国SDC企业" 耐起球羊毛非织物衬垫用于马丁代尔，直径90mm及厚3.0mm(每盒有24块)
符合标准：ISO 12945-2:2000
