The card 20 earbuds are just 13 mm thick and weigh a mere 3.5 grams, thus sitting in the ear almost unnoticeably. They are shaped anatomically to avoid placing any pressure on the ears when worn. The earbuds are produced from a CNC-machined piece of aluminium with an anodised surface. The technical features also include Bluetooth 5.0 with automatic pairing and noise cancellation. A low-profile charging box completes the set.