SAFLIPs are available in 2x2 and 2 ½ x 2 ½ inch sizes and are 5 mil thick. SAFLIPs can be heat sealed across the top of the pocket to make an airtight holder.

SAFLIP flips are made of inert, archival quality plastic: polyethylene terephthalate (PET). This plastic, derived from polyethylene, is commonly called "polyester" and is manufactured and sold under several tradenames. The most common tradename is MYLAR ® a registered trademark of DuPont.

SAFLIPs were developed by E&T Kointainer Co. in 1980 and were the first double pocket MYLAR coin flips.

PET is a very stable, inert and dense plastic. Therefore, it is ideal for any type of storage where it is desirable to have a packaging material which will not attack the contents of the package. In addition, PET allows little gas exchange through itself, so an object sealed between two sheets of PET plastic will see little exchange with the air surrounding it. PET also affords protection from ultraviolet radiation, which can cause metals to tarnish. For this reason, PET is used by museums for artifact storage, such as the Library of Congress and the Smithsonian Institution. (See list at end for institutions using SAFLIPs.) PET has a high tensile strength - it is very difficult to stretch. SAFLIP’s are made of the type of PET plastic that permits them to be easily sealed with common impulse type heat sealers

The manufacturing process for SAFLIPS is a unique one in that cleanliness is maintained rigorously. Both the product and its packaging is free of contamination which might adversely affect the materials to be stored in SAFLIPS. It is well known that dust or oil can be transferred from a storage product to its contents. These contaminants have been known to cause spotting or tarnish over time. Most notorious is the presence of paper or cardboard dust, which can easily transfer
 to the coins surface, causing black spots to form. The spotting is often delayed and can even show up later on previously graded encapsulated coins.

SAFLIPs are superior to soft polyethylene bags or other flimsy storage methods because they are thicker and more rigid, offering better physical protection. Once an object is placed in a SAFLIP pocket, and the flip folded over, the stored object is sealed up so that very little air is able to exchange into the pocket. This fact, plus the inertness of the PET plastic, assure that the potential of tarnish is minimised.

SAFLIPs do not scratch coins, even proof coins. (Scratching is caused by careless handling, such as sliding the coin over the open edge of a flip) The Professional Coin Grading Service (PCGS) conducted tests of all types of coin flips and concluded that SAFLIPs were least likely to scratch coins.

SAFLIPs may exhibit a rainbow or oily appearance in the pockets. This is an optical effect –Independent lab tests have shown that SAFLIPs have no oil or other contaminants.

The insert identification cards we provide are acid free – they do not turn yellow and do not give off sulphur fumes.

SAFLIPs were used by the ANA Certification Service and are recommended by many grading services. SAFLIPs are currently used by PCGS, the International Coin Certification Service and the Canadian Coin Certification Service.