The ClimbUP HD is small, black and discreet. Used under standard metal bed frame casters and glides, it appears to be a coaster and it hides captured bed bugs until swabbed out. The exterior climbing surface of the ClimbUP HD is black or white paper. The ClimbUP HD is round with total diameter of 4′ and height of 1′. The center well diameter is 2 1/2′.