Based on this product's specifications, here are some alternatives and similar models
Round head strip nails BeA R20 4.2×120 mm, 1500 pcs
Summary description:
Strip nails BeA R20 4.2×120 mm with round head, 1500 pieces per strip. Designed for use in compatible pneumatic nailers that accept R20 format strips. Suitable for structural and general woodworking tasks where long, durable fastening is required. Provides consistent feed in collated nailers and reliable holding strength for framing, decking, and construction applications.