JAYO Silk Rainbow PLA Filament 1.1kg, Multicolor Gradient Shiny PLA, Color Changes Every 8 Meters in Blue-Purple-Magenta, High Gloss Smooth Finish, 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.