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I have been playing the Bass for a couple of years now and have started to use a pick for a few songs - a Dunlop ULTEX, .88 it was given to me when I bought the bass and doesn't seem to have worn at all and seems fine but I was curious to see what other picks were like. I think it really is down to personal preference which you will like as to be honest I found very little difference in tone with any of them. Out of the pack I liked the thicker ULTEX perhaps because thats what I have got used to but also liked the Flex one, this seemed to make playing faster easier than the ULTEX but doesn't seem to be as durable. I plan to get some thicker Flex ones though as it along with the ULTEX are my short list. The purple one was pretty good too and has a grippy feel to it - almost like it has talk on it! The black one started to disintegrate almost immediacy on playing and felt very bendy even compared to thiner picks! The grey one has a grips on it which I found distracting. There was also a thin Tortex yellow one in the pack which just seems too bendy for bass playing. Anyhow I'd recommend this pack its certainly been useful for me.
I got the variety pack as a sampler and love these more than my Tortex and Ultex picks, as the beveled edge makes them easy to use, while the slightly raised pattern on the middle of the Flow's give me excellent grip without being irritating. I would definitely recommend them.