Comes in kit form, you must slide the pieces together and glue them into place.
1/Pack

The key for how to look at these dimensions is found next to the product image above.

30mm Size Dimensions: Spokes: 8 R=1 3/16" (30mm) D=5/32" (3.8mm) L=27/32" (21mm) r=3/32" (2.2mm)

35mm Size Dimensions: Spokes: 8 R=1 3/8" (35mm) D=3/16" (4.8mm) L=15/16" (24mm) r=3/32" (2.2mm)

47mm Size Dimensions: Spokes: 8 R=1 27/32" (47mm) D=3/16" (5mm) L=31/32" (25mm) r=1/8" (3mm)

54mm Size Dimensions: Spokes: 12 R=2 1/8" (54mm) D=7/32" (5.6mm) L=31/32" (25mm) r=1/8" (3mm)

60mm Size Dimensions: Spokes: 12 R=2 3/8" (60mm) D=1/4" (6mm) L=31/32" (25mm) r=1/8" (3mm)

66mm Size Dimensions: Spokes: 12 R=2 19/32" (66mm) D=1/4" (6.4mm) L=31/32" (25mm) r=1/8" (3mm)