Shin Bio Heat Packs

- Safe; contains only water, sodium acetate and its aluminium disc.

- Depending on size; heats for at least 30 minutes and up to two hours.

- Has a variety of sizes and is very portable.

- Provides heat, simply click the metal disc.

- Provides cold, simply place in the refrigerator for 1 hour.

- Reuse multiple times by simply boiling.

- Has a 1 year warranty.