The HeffalumpsThe Heffalumps The tray is 9. 5" x 5. 5". It has 5 inserts. The Block: is just over 9" x 2. 75" It can hold 10 10 10mm or 14mm buckets bangers; the holes are deep enough to also hold dabbers upright. (2) 14 18mm buckets bangers, or carb caps. 4 slots for tools. (2) insert trays are the Large Cap Holder Insert; each one can hold 4 caps or large marbles. Insert tray (4" x 1")this has a flat bottom. Small cap marble insertcan hold 4 small marbles. The