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The Ultra-Inviso bases will be around the thickness of a blister pack as that’s what the first ones were initially made of.While I’ve no experience with then, it strikes me that they’re cheap enough to replace, from time to time, it they get dinged or degrade. Especially if you make own using the guide that the Pulp Alley team kindly created and put up on YouTube here
There is one clear choice: ULTRA-INVISO™ BASES hand made by Wolf Girl, aka Mila Phipps, for the Phipps Cartel, aka Pulp Alley, game, store, lifestyle, cult, or obsession, whichever you prefer.I'm also rolling mine own with the handy dandy rusty trusty punch stolen from the dormant leather shop, or that nifty mech punch I purchased from Michael's.Using mallet & metal does add a stress relief factor to making bases though, not to be dismissed lightly.The very thin-ness of Mila's ULTRA-INVISO™ bases is what sold me, over other offerings out there.To me they look & "feel" better with un-based vehicles, aircraft, buildings & scenery, whether next to or ON 'em.For Song of Drums and Tomahawks I plan to ULTRA-INVISO™ base those Minquas & stalwart Swedes on the Delaware I paint to blend with forest, field, fort, rock, redoubt, ship, shore or snow. Ditto an upcoming future foray: Space Pulp endeavours with Valkeeri & their Radon Zombee Askaris. I quite like the way the thin discrete ULTRA-INVISO™ bases make my figures look good standing on ANYTHING.& it's actually much easier, & far less labour intensive or materiel hungry than traditional scenic-ed bases.YMMV
I used plastic from the ultra-pro rigid card sleeves as recommended on another thread here and I think it works pretty - very rigid (more so than the type typically used in the clamshells that miniatures come in) and not susceptible to scratches (so far anyway). The plastic looks to be identical to the one used in that ultra inviso picture.