1. Chrome plating sou sifas la pou amelyore rezistans mete;
2. Twou ki lach yo plake ak chromium pou amelyore depo lwil oliv sifas ak pi vit kouri-an;
3. Grave sou sifas enteryè a pou amelyore elastisite;
4. Yo bay yon Groove depo lwil oliv sou sifas ekstèn bag la pou fasilite wilaj;
5. Sifas deyò bag la plake ak kwiv pou fasilite kouri-an;
6. Molybdène flite sou sifas ekstèn bag la pou diminye adezyon ak mete.

Rezime jan sa a:
Amelyore rezistans mete: chrome plating, nitruration
Amelyore inisyal kouri-an pèfòmans: kwiv plating, phosphating, sulfurizing
Pou anpeche mete adezif: espre molybdène