it is desirable to have the playing surface only about 2 inches above the surface upon which each hole is positioned to be played to facilitate playing the game by a player fig3 shows additional details of construction of the units sides 3 are attached to braces 11 by means of rust resistant screws 12 which are typically either aluminum or stainless steel floor 10 can also be attached to braces 11 by similar means an optional feature that can be provided around at least part of the interior side wall is a linear bumper 13 the bumper usually a rubber material having a triangular cross section is adhesively or otherwise attached in a groove 14 in the face of side 3 the linear bumper can be placed around the entire periphery of the unit or it can be placed only in certain places as desired typically the bumper will be provided at locations in close proximity to the cup it is important that the height of the linear bumper i e the vertical distance from point 13a to the top surface of carpet 4 be within a specified range the placement of the bumper should be such that the ball contacts point 13a at a point about the middle of the ball or at its largest circumference for a conventional golf ball.