Dumbbell Foot Attachment, Tibialis Trainer, Adjustable Ankle Weights, Ankle Straps for Weight Lifting, Leg Workouts at Home for Hip Flexors, Shin Splint, Hamstring Curls, Leg extensions Black Pair pets_July2024_update Also serving sizes may appear hidden Also serving sizes may appear smaller as we don't add fillers like Silica Dioxide (sand) to increase size and weight per serving with no benefit like alot of companies Only Vibrates and does not Shock Beeps and vibrations get your stubborn dog's attention well and correct his bad behavior without hurting him friend or gym lovers as a great gym accessory or a decent alternative for a leg curl extension machine Easy to Use