The Astrojax Spectra line is for jaxers ages roughly 7 to 97. The low-friction, longer (90 cm), thinner (1.7 mm) string and heavier (roughly 26 grams) balls provides smooth, easily controllable orbits.
The Spectra string is about the same thickness and the balls are about the same weight as those of the (discontinued) Aqua version of Astrojax. End stoppers are created by knots around black o-rings. The extra stretchiness of the thinner string is why Spectra orbits, particularly at the bottom of vertical orbits, feel so smooth.
Ships with a flexible, translucent docking station.