We have three red-eared slider turtles and in their tank we put two Zoo Med Turtle Docks.  Aquatic turns need a chance to dry off and sun themselves and these docks are great for that.  They move up and down according to the water level.  They seem like they are easy enough for my turtle to get on and they use them frequently so they must like them.  I think they come in a few different sizes.  We have two different sizes and they have lasted several years. 

A couple of cons about the product would be they seem kind of expensive for what they are and they are hard to clean and scrub off. ...