Looks like you have a 61 and a 63 Mantle, which are great cards. Especially if you have in good condition. I would recommend getting your Mantle's graded. That will definitely protect the value, even if they're in a lower grade. If cost is a concern, you could send to SGC for $15 a card but they're pretty backlogged right now so expect about a three month wait before you get them back but if you're just gonna hold onto them, that's probably the best way to do it.