1: cap and backparts in brass U7 - eco black metal PD finish
2: cap and backparts in brass E2 - eco nickel free finish.
3: cap and backparts in brass U7 - eco black metal PD finish.
4: cap and backparts in brass E2 - eco nickel free finish
5*: multi-prong nail and back-parts in brass U7 eco black metal PD and E2 eco nk free finish.