What wing covers?

[stagman]

Just wondered what type of wing covers you guys use? I have some sykes ones with the magnets in, these have been good and stay in place quite well and WAS pleased with them but it looks like the magnets have picked up some metal bits and last time I used them it scratched the wing! I can feel some rough bits there but cannot see or remove them, tried sticky tape, vaccuum etc. So reckon I will have to get some new ones, I have looked on ebay and there are some described as "non slip no magnets", anyone used these? Do not want to waste anymore money so do I try these or get some more with magnets and be more careful with them ?