Specification 1) thick: A-clase material has 0.1mm, 0.15mm, 0.20mm three kinds; B-clase material has 0.1mm, 0.12mm, 0.15mm, 0.20mm four kinds 2) length: 8mm~ 15mm 3) package: common case or high-grade cas 4) quantity: 60bundles/ case 5) curl: J; C two kinds.