Yes, but 7 inch in diameter is probably too long! Actually just my guess while at home I have several of rubber bands in size of 130mm×15mm×3mm and those fit well but not protecting for real as one size to big, might slip away when phone fells down, therefore I guess that ideal diameter would be around 110mm. Anyway next smaller size, natural rubber one, perhaps same thing in black, that I just found would be in dimension 95mm×15mm×3mm: Elastische Gummibänder Schreibwaren halter Paket liefert Gummiringe für Schulhaus oder Büro Perimeter 320-600mm - AliExpress 15 (don’t have this linked one but in this thickness of 3mm might be just perfect, as stretched to less than 2.5mm 
). You’d need to remove it completely just for charging or connecting headsets purpose.
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