Andoer Stainless Steel End Pin with Ebony Plug for 3/4 4/4 Cello Sturdy Durable Made of stainless steel, copper alloy and ebony. Strong and sturdy enough to bear weight of cello. Rubber cup on bottom adds much friction. 49.5cm / 19.5in in length. Designed for 3/4, 4/4 cello .