The Circus Diabolo by Henrys is a good diabolo for beginners and professionals. The shells are made of a extremely durable yet flexible plastic. The center is made of two aluminum hubs with a steel axel in the center. You can buy this diabolo with several different axels, the sock axel is the most common one used. 

Video content Donald Grant performing on the Renegade Stage EJC 2002 ( the diabolo used is not the same type/brand as on this page)

Width 5 inches (130mm)
Length 5.5 inches (140mm)
Weight 10.65 oz. (302 grams)
center gap 1/8" (3mm)
Made in Germany

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