Micro Gainz Weights are a set of 8 sintered steel plates, each with a 1-inch diameter hole, designed for weight lifting and strength training. Made in the USA by the brand Micro-Gainz, these colorful plates allow you to gain muscle by adding 1 lb at a time. With a unisex design and various sizes included in the set, these weights are a versatile tool for fitness enthusiasts looking to incrementally improve their strength and muscle mass.