Senior is for intermediate and adult blades(usually 13 years of age and over). Rezztek has a new patented four-layer material, each layer specifically designed for your top performance. Here’s what you get with your Rezztek Purchase: 2 Pairs of Rezztek: This includes 2 Forehand & 2 Backhand Specifically designed for use on goal sticks Each pair lasts up to 10 games Layer 1 - Powerful adhesive with clean removal. Layer 2 - Super strong fiber mesh for maximum durability. Layer 3 - Resin for minimum energy loss and maximum flexibility. Layer 4 - Grip surface for better puck control, shot speed & accuracy. Rezztek is also Water resistant and Water repellent to keep you at the top of your game.