different sizes and shapes. Tables come in two basic shapes, round and rectangular. Most wedding use a combination of these two shapes. The most popular sizes for round tables are 48", 60", and 72" with the 60" being the most popular. The rectangular tables most often rented are the 72" and the 96" ones. These tables are usually 30" wide but also come in narrower versions. All of the tables are available with plywood or plastic tops.
For seating numbers see my post "How many per table".