ZipperStop Wholesale Authorized Distributor YKK&reg; 16" Jacket Zipper ~ YKK #5 Aluminum Metal ~ Medium Weight YKK Zipper -Separating Bottom ~ Black (1 Zipper) ZipperStop Wholesale Authorized Distributor YKK 16" Jacket Zipper ~ YKK #5 Aluminum Metal ~ Medium Weight YKK Zipper - Separating Bottom ~ Black (1 Zipper) YKK aluminum zippers are made from the highest quality metal. Thoroughly tested to ensure strength & reliability. Aluminum Teeth.