Plastic cup of memo magnet with round shape,this item round shape memo magnet made with plastic cup and neodymium disc magnet.They have very strong force,and have two molds can choice.Normally done with ZN or NICUNI coating to protect be rust.See below table of specifications.You can choice which item is good for you.Also,custom package is possible.You can send me details.
Model
D20
20
7.5
3
10 pieces
D30
30
9.5
9
15 pieces