They are produced with a SELECT MIX of 3 rebound levels for 7 durometers: more rebound for softer material and less for higher duros. They come in two different sizes, standard 15.5mm, and tall 19.25mm, and seven different durometers, 98a(transparent), 95a(orange), 92a(yellow), 89a(green), 86a(red), 83a(purple) and 80a(white). All of this along with a new inner size for very precise fit, which makes the feel fluid and locked while turning.
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