|A lightly used Red Tortex pick|
The Tortex picks have a smooth surface and seem to be very durable. I think the Red one is the lightest pick in the Tortex line. Some days the Orange Tortex .60 mm pick feels better to me. I alternate back and forth a lot between the Orange and Red, but the Red is the one I use more often. For a while I was trying out Tortex (and Clayton) picks in the larger triangle shape that bass players like, but I've since returned to the standard wedge shape.
I also use these Red and Orange Tortex picks when I play mandolin, but I make contact with the strings using one of the rounded edges instead of the pointy corner. It reminds me of the rounded corner "Dawg" style Goldengate mandolin picks when I hold it this way, but is not anywhere near as thick. The Golden Gates have a very mellow sound. I like the bright sound of the Tortex picks.