One 5/16" x 1/32" neodymium disc magnet. These are used as spacers for some battery applications. This large spacer is recommended for 14500, CR123A, CR2, 18650 or other larger batteries if needed.

Carefully place the magnet on the positive terminal of your battery to gain an extra 1/32" length. For some batteries more than one spacer may be needed.

The penny is not included :)

These neodymium magnets are extremely strong, and must be handled with care to avoid personal injury and damage to the magnets. Neodymium magnets are brittle, and can peel, crack or shatter if allowed to slam together. Eye protection should be worn when handling these magnets, because shattering magnets can launch pieces at great speeds.

The strong magnetic fields of neodymium magnets can also damage magnetic media such as floppy disks, credit cards, magnetic I.D. cards, cassette tapes, video tapes or other such devices. They can also damage televisions, VCRs, computer monitors and other CRT displays. Never place neodymium magnets near electronic appliances.

Children should not be allowed to handle neodymium magnets as they can be dangerous.  Small magnets pose a choking hazard and should never be swallowed or inserted into any part of the body.

Never allow neodymium magnets near a person with a pacemaker or similar medical aid. The strong magnetic fields of the magnet can affect the operation of such devices.

Neodymium magnets are brittle and prone to chipping and cracking. They do not take kindly to machining.

Neodymium magnets will lose their magnetic properties if heated above 175° F (80° C).

Neodymium magnets should never be burned, as burning them will create toxic fumes.

Like any tool or toy, neodymium magnets can be fun and useful, but must always be treated with care.