1,metal spiral coils 2,colorful color for choice 3,service OEM order 4, ... ; fastdelivery,bright suface 5,pass SGS test 1, metal spiral coils are guaranteed by ROHS and ASTM certification2, thin smooth and ... (including colors,package style ect,.) The specification of metal spiral coils:size(inch)diameter(mm)wire gauge(mm)1/4"60 ...