Study and demonstration of the Loop The Loop and the Roller Coaster has become easier. This triple play apparatus consists of three tracks, one 28″ straight down, one 54″ with one 3.5″ loop, and one 70″ with two loops (3.5″ and 8″ diamter). All three have different straight up track lengths. At the end of each track is a catch sack for the ball.Supplied complete with two different dia. steel balls, 0.62″ (15.86mm) and 0.75″ (19mm). Wooden Base measures 15.75″ x 9.5″ x 0.65″.