Shapes
Some picks have small protrusions to make them easier to keep hold if the fingers start to sweat, which is very common on stage due to the hot lights. Some picks have a high-friction coating to help the player hold on to them. The small perforations in the stainless steel pick serve the same function. Many players will often have spare picks attached to a microphone stand or slotted in the guitar's pickguard.
The equilateral pick can be easier for beginners to hold and use since each corner is a playing edge.
The shark's fin pick can be used in two ways - normally employing the blunt end or the small perturbations can be raked across the strings producing a much fuller chord or used to employ a "pick scrape" down the strings producing a very harsh, scratching noise.
The sharp edged pick is used to create an easier motion of picking across the strings.
Bass players who use a pick normally use much heavier picks than guitar players. Some players prefer slightly thinner picks to increase speed and endurance.
Some guitar pick shapes are patented. Usually those patents claim ornamental design.
Read more about this topic: Guitar Pick
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