Rollerblock Jr. consists of of 8 tops and bottoms and 4 center bearings, to make 4 "Double Stacked" isolator/coupler units. Each top and bottom is constructed of black anodized, aircraft alloy aluminum, and has a 1.875" diameter (4.76 cm) and 5/8" (1.58 cm) thickness. These dimensions were carefully chosen to make Rollerblock Jr. easy to use and set up, yet strong enough to withstand the rigors of use under heavier equipment such as large amplifiers and heavy loudspeakers. The special cup interior has been designed so that the top and bottom "sandwich" is stable with the ball inserted in the center, making for easy setup. The bottom and top are flat and suitable for all equipment chassis, as well as flat surfaces and carpeting.

HDSE stands for "Heavy Duty Special Edition" but it could also stand for "High Definition Special Edition." HDSE is identical in size and form to standard Rollerblock Jr. but has the following enhancements: