|LEGO → System → Universal Building Set|
4281 Classic Trial Size is a set released in 1999. It contains 25 pieces. It contains a selection of 2 x 2 and 2 x 4 bricks and 2 special type bricks. A Red Brick, modified 2 x 4 x 2 Double Curved Top with Yellow Face, Freckles and Ears pattern, and also a Green Brick, modified 2 x 4 x 2 Double Curved Top with White Stripes pattern.
- 4281 Classic Trial Size was released in a polybag.