blocks are approximately 7 3/4" from top to bottom, dimensions of the transition piece (top) are height 4" width 3 1/4". purchase price is for 13 BLOCKS. 12 inside corners and one free middle transition. These have fabricated to use with moulding up to 4 3/4", they are much different than the standard home depot block (for ) in that i've used a popular Alexandria crown molding (4 1/2") in the tear drops for added detail. the Alexandria molding is sold n most Home Depots and most building supply houses.These have also been primed with Zinsser 123 stain blocker and painted two coats with Benjamin Moore super white semi-gloss paint! I also have bare pine if necessary, block is pictured with colonial 4 1/2" crown moulding. This listing includes a free middle transition block which bridges two pieces of crown in lieu of an ugly scarf joint as depicted in the latter photos. This lot is a custom fabrication and cannot be purchased anywhere else! It is a steal! If you need more or less e-mail me with quantity of each needed and I will create a listing for you.