There was some discussion about these on The Shaving Room, it was generally agreed that they're made of wood and painted silver. I bought a pack but have not been brave enough to try them.
Well I tried them last night in my DE89 and they were ok. My normal blade is the yellow 7o'clock, compared to them they were ok. I found them to be more comfortable than an Astra SP with the same result. At £8 for 100 not bad but with blades YMMV.
I've tried the as well and found them to be smooth for about 2-3 shaves then becoming very rough extremely quick. These seem to have a sharp fall of ones they start to dull. Paid .88 for 5 figuring no harm no foul at that price...