I've got 3 Red Tips, 56, 57,and 58. All three are different colors on the bare metal parts. The 56 looks almost like it's plated, the other 2 just look like brushed metal. I've tried to polish the 57 and 58 to make it shine like the 56 but it just doesn't have that shine. I was wondering if they were made of different metal or if some of them were plated instead of just bare metal. The red tips are all the same. Thanks for any info.