Choosing between the right inner sleeves is all about balancing the “feel” of your shuffle with the level of protection your cards require. Here is a comparison to help you decide between the flexible Viper Cores and the rigid Hard Cores.
| Feature | Viper Cores (Soft) | Viper Hard Cores (Rigid) |
| Primary Goal | Slim profile & smooth shuffle | Maximum rigidity & impact defense |
| Thickness | Standard Slim (0.05mm per side) | Double Thickness (0.1mm per side) |
| Flexibility | High | Low (adds structural support) |
| Deck Bulk | Minimal increase | Noticeable “hardenened” feel |
| Recommended For | Every-day play & high-repetition shuffling | High-value staples & “Grail” cards |
| Dimensions | 64mm x 89mm | 64mm x 89mm |
| Quantity | 100 Sleeves | 100 Sleeves |
You want your 100-card Commander deck to remain as slim as possible.
You prioritize a fast, effortless shuffle during long tournament days.
You are looking for an affordable, high-quality standard for your entire collection.
You want your cards to feel “encased” and more difficult to bend.
You are protecting expensive foil cards and want to help prevent “curling” or warping. Will not unbend a warped foil.
You prefer a heavier, more substantial feel to your deck in hand.
Regardless of which core you choose, both are precision-engineered to fit perfectly inside Viper Snakeskins. By pairing a Viper inner with a Snake Skin outer, you create an airtight seal that locks out moisture, dust, and oils entirely.