The EAI Gold Medal Premium sprocket is different. Most fixed sprockets are designed with bevelled teeth- slants designed to counteract imperfections in chain tension and/or chainline. However, these often make for a noisy transmission until they bed in.
Where do Rapha find their wool? It says 100% extra fine Merino on the label but we know for a fact that no normal wool is this soft. They must have a whole flock of sheep hidden away somewhere that are fed exclusively on marshmallows and soufflé. And, if wool like this exists, why did we have to endure that Brillo Pad stuff for years?