Custom track (low headroom or high lift for overhead clearance) High-cycle torsion springs with extended warranties – standard torsion springs are rated for 10k cycles. 20k, 50k, and 100k cycle springs are available for most doors Quiet safety package to allow for smoother operation – Nylon bearing rollers, wider drums, and DC-powered operator make a big difference in volume Garage Door Rodent Guard – prevents squirrels, mice, and other rodents from chewing under the garage door