Our guarantee is so simple! If within 90 days you are not fully satisfied with any of our magnetic products then return them together with your proof of purchase for a refund. 15% of the original price will be deducted to cover handling (except in the case of Motoflow, Thermoflow and H2 Flow). We are happy to give a 12 month guarantee against faulty parts and workmanship on all our magnetic products. The properties of our magnets are guaranteed for life.