Should I penny sleeve my cards before I put them in magnetic card holders? Found these holders on Amazon and was wondering if they were any good? : r sportscards Amazon.com: Cardboard Gold Penny Sleeves for Trading Cards 1000 Count Card Protector Sleeves with Durable, Crystal Clear Plastic for Baseball, Sports, Collector, Standard Sized Cards 2 5 8 x 3 5 8 (67x94mm) : Toys & Games Minimalist Button Wallet & Business Card Holder Bellicose Leather Co Bellicose Leather Co. Personalized Full Grain Leather Slim Mens Bifold Wallet Tan 50 Card Savers + 100 Penny Sleeves For MTG, Pokemon, PSA Grading & Card Protection VC207P Minimalist Genuine Leather Card Holder with RFID Blocking, ID Window VC207P Litchi Brown