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- Inner envelopes are seamless with 100% no splice
- Outer envelope cross section fitment is tighter than other brand
- Envelopes are pre-lubed with ProChem Envelope Lube
- Envelopes are equipped with a large base valve
- A Sure Seal Adapter is installed & ready-to-use
- J Hook Indicator Stripes so you get the valve right
- Rubber Wicking can be pre-installed on all envelopes
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