These are some big shelves. Why not display your favorite items on them? They can hold four items to display.
Display Shelf price in Growtopia: sells for about 1 WL, buyers pay about 2/WL (median of 527 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: VEZZ, HECEE, TYBUYS, WORLDPLUS, COCSIS