Based on this product's specifications, here are some alternatives and similar models
Magnets for Boards Titanum 30 mm, pack of 6 — Titanum
Summary description:
Pack of six Titanum board magnets, each 30 mm in diameter, designed for use on magnetic whiteboards, notice boards and other ferrous surfaces. Compact round design provides reliable hold for papers, photos and lightweight documents. Suitable for office, classroom and home use where temporary fastening and display are required.