Kwadron RS long bar has needles grouped compactly in a circle — provides concentrated shading on small and medium areas. Kwadron RM long bar has needles curved in a fan across two rows — provides wide shading on large surfaces. RS is the detail brush, RM is the wide brush. RS can also be used as a thick liner, RM cannot be used as liner.

For Kwadron RS long bar, use round (circular) surgical stainless steel tubes with the size corresponding to the configuration: small tubes for 3RS-5RS, medium tubes for 7RS-9RS, and large tubes for 11RS-18RS. Round tubes are the same as for RL but with internal diameter corresponding to the larger number of needles.

Yes, Kwadron RS long bar in small configurations (3RS, 5RS) is excellent for thick, textured lines. Many Traditional and Old School artists prefer RS for outlines with a more organic, fuller character than RL. The line produced by RS has softer edges and a natural fill. It is a classic technique practiced by generations of artists.

Kwadron RS long bar works with any quality coil machine. For shading, use a coil shader machine (larger coils, longer spring) with a 3.5-4mm stroke. For thick liner use, you can also use a liner machine with small RSs. Recommended machines: Dan Kubin, Vlad Blad, Workhorse Irons, National, and other artisan brands.

Yes, Kwadron RS long bar in 3RS or 5RS configuration is excellent for stippling and dot work with coil machines. The direct haptic control of the coil machine allows precise timing of needle impact with skin, producing uniform, controlled dots. Many dot work artists prefer coil machines precisely for this superior control on each individual dot.

5RS and 7RS are the most versatile Kwadron RS long bar configurations. 5RS functions both as thick liner and concentrated shader — the most versatile needle in any kit. 7RS offers moderate coverage with good control, suitable for shading in medium areas. Together, these two configurations cover most shading and thick lining needs.

For shading with Kwadron RS on a coil shader machine: set a moderate stroke of 3-3.5mm (smaller than for RM), voltage at 6-9V, and adjust the spring for moderate speed. RS requires less stroke than RM because the compact configuration does not need long travel. Adjust the needle to extend 1-1.5mm from the tube for concentrated shading.

Yes, Kwadron RS long bar is available in short taper, medium taper, and long taper. Short taper for rapid saturation in traditional style. Medium taper for general versatility. Long taper for fine, delicate shading in realism. Available diameters are 0.25mm (#8), 0.30mm (#10), and 0.35mm (#12).

Kwadron RS long bar needles come in standard packages of 50 pieces, each needle individually EO gas sterilized and separately packaged. This generous quantity reflects the higher-volume usage specific to coil machines and offers a more advantageous per-needle cost than cartridges. Packages are stored at room temperature in original packaging.

Kwadron RS long bar in small configurations (5RS, 7RS) is a good choice for beginners learning on coil machines. Kwadron's superior quality eliminates needle quality variables, allowing the student to focus on technique. Start with 5RS to learn both shading and thick lining — it is the most versatile starting point.