Paracord Planet Double Barrel Black Cord Lock Draw String Toggle Stopper - Choose from 5, 10, & 20 Pack Sizes Dimensions: 5 x 14.7 x 19mm Color: Black Material: Plastic with internal metal spring (spring loaded) Press the button to release tension to move up & down a drawstring to desired location Add it to any drawstrings, lanyards, backpacks, and more!