The shorter pegs a lot in terms of preventing the caterpillars from pupating on the pegs. Large 50ml capacity floral tubes for less refilling. Large Floral Tubes fit securely in short Peg Rack to keep milkweed cuttings upright and secure for your caterpillars. Best for holding floral tubes in place to serve milkweed leaf, stem cuttings, flower cuttings to feed hungry caterpillars or butterflies. Space out 4-6 floral tubes over rack, caterpillars are less likely to pupate under leaves.