Krystal Premium Toilet Seat Covers, 250 Covers/Box, 20 Boxes/Carton KRSK5000 Review BattleWasp June 27, 2018 August 29, 2018 No Comments on Krystal Premium Toilet Seat Covers, 250 Covers/Box, 20 Boxes/Carton KRSK5000 Review Half-fold covers fit all popular seat-cover dispensers. 100% biodegradable.