Product Features:
This is a high quality, lightweight, compact, tubular radar reflector
To be mount onto a stay or shroud
Aluminum sheets folded at about 90 degree angles and stacked up in the plastic tube provides a larger reflective area which help increase the Radar Cross Section value.
Specifications: 
Length: 22 3/4" (578 mm)
Diameter: 2" (50 mm)
Weight: 9 oz (272 gr)