Pen Model and Specification: The document specifies two types of insulin pens: U-40 and U-100. The U-40 model is available in 0.5ml and 1ml capacities, while the U-100 model is available in 0.3ml, 0.5ml, and 1ml capacities.

Needle Specification: The needles for these pens come in various sizes, ranging from 0.2mm (33G) to 0.45mm (26G). The specific sizes include 0.2mm (33G), 0.23mm (32G), 0.25mm (31G), 0.3mm (30G), 0.33mm (29G), 0.36mm (28G), 0.4mm (27G), and 0.45mm (26G).

Insulin Syringes Detailed Specification: The document provides detailed specifications for insulin syringes, including unit scale nominal capacity, minimum ruler length, and ruler interval/unit. For U-100 syringes, the capacities are 0.3ml, 0.5ml, and 1.0ml, with corresponding minimum ruler lengths of 41mm, 43mm, and 57mm, and ruler intervals of 1 unit. For U-40 syringes, the capacities are 0.5ml and 1.0ml, with minimum ruler lengths of 43mm and 50mm, and ruler intervals of 0.5 and 1 unit respectively.