Wear Shoes Wear shoes are available in UHMW-PE, polyurethane, and metal varieties in several configurations and hole patterns. Filler Blocks Polypropylene or polyurethane filler blocks are used in conjunction with fiberglass flights and F2 attachments, acting as a rigid spacer between the back of the flight and the attachment paddle. Flight Hardware Available in 304 or 316 stainless steel in 3/8 inch diameter or ¼ inch diameter. Neoprene Wipers In applications where skimming of a beach is required, NRG can equip our flights with neoprene belting and fiberglass backing for more efficient removal of floating material. Flight Stiffeners Fiberglass or steel stiffeners can be furnished on long flights or on flights which experienced heavy uneven loads. Spring Side Squeegees Spring brass squeegees can be furnished on 2 flights per mechanism to ensure positive cleaning of tank side walls and provide full width skimming on the flight return run.