20 Pack, 14", Black, Self Cutting Cable Ties, Made From Durable 6/6 Nylon, 50 LB Tensile Strength, Easy To Use, Simply Lock & Twist, Doesn't Require A Reduction In The Strength & Durability Of The Cable Tie Material Or Multiple Rotations To Achieve A Break In The Tie, Instead, A Small Cutting Blade Designed Into The Head Of Each Tie Ensures A Tight Lock & Quick, Clean Cut, Improving The Appearance Of The End Result & Virtually Eliminating Residual Jagged Edges.