spring of engine valve 1.good price 2.high quality 3.full of types 1. the wire diameter: from 2.7mm to 5 mm2. the raw material: oiled and tempered alloy steel wire3. types: 16 kinds4. Applied Model of engine: D28,DB58/33, D1146,DE12,DE12TIS, DE08TIS,DV15TIS, DL08,DV11,DL06.5 we can provide 3-5 samples for your test for free but the freight to be paid by customer ENGINE VALVE SPRING