Based on this product's specifications, here are some alternatives and similar models
Fixed-weight dumbbell set Schildkröt 960010 — 6 pcs, black/green
Summary description:
Fixed-weight dumbbell set Schildkröt 960010 includes six pre-weighted dumbbells in black and green. Designed for strength training, conditioning and home workouts, each piece provides a specific fixed resistance without adjustable plates. Compact and ready-to-use, the set suits circuit training, rehabilitation exercises and multi-user gym stations.