About This Complete 12-Piece Set :Two keepers in each of six inner widths (0.55in, 0.63in, 0.71n, 0.79in, 0.87in, 0.94in) so every watch in the house is covered; no more mismatched or missing loops. Premium Silicone Material:Made from high-quality silicone that is soft, lightweight, flexible yet strong. Resistant to wear, fading, and breakage for long-lasting performance. Easy to Install and Secure:Flexible loops are easy to stretch and slide onto your watch band. They hold the strap end tightly in place and can be swapped in seconds. Wide Compatibility:Designed to fit most most wristbands or smartwatches. Just measure your band width in millimeters and add 0.04in to choose the right size. Sleek Look, Great Gift:Stylish black color complements all band styles and colors. Ideal for personal use or as a thoughtful gift for watch enthusiasts. Overview Metal type : Silicone