JAYO Silk Quad-Color PLA Filament Red-Yellow-Green-Black 1.1kg, Four-Color Gradient PLA, High Gloss Shine, Smooth Layer Concealment, Fits for Most FDM 3D Printers

Multi-pack bundles are the point — buying 4 or 10 spools at once brings the per-kg cost down sharply compared to individual purchases. Good for anyone running the same color through a lot of prints and watching their material budget.