50 Grams per Bundle, Typically takes 150-250 Grams to Complete a Full Head. I-Tip Hair Extensions are Needed for Microlink Installs Also Known as the Strand by Strand Method (Microlinks with itips). *If You’re Getting a Service & You Want to Upgrade to a Longer Length be Sure to Select Enough Bundles to Complete a Full Head (A Full Head Typically Takes 150-250 Grams).