Compact, small but still have a lot of options. This caster has chrome plating, dust-proof ring, double ball raceway and even brake. The rubber wheel is soft, noiseless yet very durable. A high-end product Light duty caster indeed (!)
Solution to minimize overall height and maximize load capacity. Dual wheel casters also improve stability and swivel more easily than wider-face single wheels. However, this 40mm diameter caster is the most "ugly" one of the Series.