I bought these to use with a Food Saver vacuum sealer and they work well. Really good. 4 mil thickness prevents holes when packing sharps. The black background provides great contrast, but you may need a white or silver marker to mark your pockets. Overall I am impressed with the quality and price of these reels. Since I bought these, my 5 year old food saver has bitten the dust and I've switched to a chamber sealer. While I can't recommend them for chamber sealers due to the price, I can attest that they work great.
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