Materials: Stainless Steel with copper plated - Rust Proof 3. Easily stack them into each other for easy storage4.Sturdy Locking Rings to Hold corresponding pieces together. 3/4 TSP - 3.75 ML,1/2 TSP - 2.5 ML,1/4 TSP - 1.25 ML,1/8 TSP - 0.63 ML,1/16 TSP - 0.32 ML,1 Leveler,1 locking ring.