These block felt style cards are great for shrinking back windows. The soft felt skips over small imperfections and rocks that might be underneath the film to prevent tearing the film like a typical plastic hard card would otherwise do. They are also more forgiving when shrinking the back window if you were to accidentally crease the film. the lighter pressure won't damage the film.
I used it on one full car and it already kinda is bunching on the corners, I think I’m pressing it hard af tho but it’s very smooth and nice to use to shrink.
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Willeme MOREAU
Felt Card for Shrinking
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Samjinder Singh
Rounded felt car -the best one!
i have used other wool felt card before but this is on the top of the list, nothing else can compete.