Had this come in: Try;- https://www.supermagnete...ng/safety_neodymium.php It may be of help Also because of their high attraction strength there a possibility of a small pinch injury.

Further info update Recommended safe distances neodymium magnets Object Magnetic field damaging at: S-45- 30-N S-20- 10-N S-15- 08-N S-10- 03-N S-06- 02-N High-quality magnetic card (credit card, ATM card) 40 mT (= 400 G) 46 mm 19 mm 15 mm 9 mm 6 mm Cheap magnetic card (parking garage, admission ticket) 3 mT (= 30 G) 134 mm 55 mm 42 mm 24 mm 15 mm Pacemaker new 1 mT (= 10 G) 201 mm 82 mm 62 mm 35 mm 22 mm Pacemaker old 0,5 mT (= 5 G) 257 mm 104 mm 80 mm 43 mm 28 mm Mechanical watch, non-magnetic pursuant to ISO 764 6 mT (= 60 G) 103 mm 42 mm 32 mm 18 mm 12 mm Mechanical watch, not non-magnetic 0,05 mT (= 0,5 G) 571 mm 230 mm 176 mm 98 mm 61 mm Hearing aid 20 mT (= 200 G) 63 mm 26 mm 20 mm 12 mm 7 mm Vehicle key No danger USB stick, memory cards No danger CD, DVD No danger Camera, cell, smart phone No danger for data carrier Hard drive Unclear So James mobi's should be ok. The first pair of figures are the strength measurement in either Gauss or Tesla, the other figures relate to distance to be kept away from an object, ie, pacemaker.