I'm selling this because I haven't been using it since I moved. You can adjust the height of the block to train on flat ground or simulate hill climbs. It's getting cold, so how about some indoor training! Main Unit - Brand: CycleOps - Model: FLUIDE 2 Block - Brand: Saris - Model: Climbing Riser Block [Condition] There is some wear and tear, but I think it's perfectly usable for those who understand USED items!! Instant purchase is OK if you have no questions!!!