they were sold as original replacement bearings for the Yeti SB66 switch link, which normally are enduro max bearings. are these the normal ones? any info could help! the shop then would have a bigger problem than just 45€ bearings disintegrating after a month...

 @jzPV: Hi jzPV, yes it looks like some Chinese crap made of cheese. Enduro Max bearings as Keit remarked have bigger and more balls, no retainer cage and are able to withstand higher loading pressures. Moreover, their max bearings are black (magnetite nanoparticles added since 2014) to suppress corrosion, seals are brick-red with clear label MAX ENDURO and a number of your bearing...usually something like 6200...http://www.enduroforkseals.com/id169.html

Yeti kit here: www.enduroforkseals.com/id251.html

My Trance has Enduro bearings in BB, needle in a rear shock eyelet, hubs, and pivots...still holding strong (2 seasons of muddy Czech trails). If you are in Deutschland, you can order from bike24.de without shipping from the US. Cheers

 @Kaspy: thanks guys!
I just blindly trusted the shop... they are definitely no enduro max bearings but they seem to be the cheap normal enduro bearings for 5€. the original bearings weren't black (2013 frame). I contacted silverfish.uk to have an official confirmation to use in a complaint against the shop and I hope I can get my money back. I also found the right bearings on bike24, unfortunately they are not available but I will see what they can do.

 @jzPV: Well, different bearings for different applications. Radial bearings with cage are great for high rpm application without side loading. In pivots, you need big balls, no retainers for massive pressures and hits...in hubs, headset, and bb preloaded angular contact bearings. I was in the same position as you. My local shop used SKF radial bearings with cage...they are superb, but not in pivots. If I recall correctly, they lasted two months. Good luck!