The DROPS Pro Classic Interchangeable Circular Needle Set (now often labeled as Pro Spark) is an affordable, high-quality set featuring 8 pairs of smooth, nickel-plated brass tips (3.5–8.0 mm) and 4 cables (60–100 cm) in a clear zippered case. These durable, fast-knitting needles are compatible with KnitPro/Lykke cables. 

Key Features and Contents:

Needle Tips: 8 Sizes: 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0, and 8.0 mm.

Material: Lightweight, polished brass with a nickel plating for smooth, fast knitting.

Cables: 4 cables to create lengths of 60 cm, 80 cm (), and 100 cm (including tips).

Accessories: Includes 4 end stoppers, 4 tightening keys, and a clear storage pouch.

Compatibility: The connections are compatible with other brands like KnitPro and Lykke.

Commonly Used Range: The 3.5 mm–8.0 mm range covers most standard, medium, and bulky knitting projects. The tips are designed with a smooth join, preventing yarn from snagging, and are well-regarded for their durability. 
Note that in some markets, this set is branded as DROPS Pro Spark.