From Acme, makers of specialist whistles since 1870, these durable plastic dog whistles will be your new go-to for training. Choose from the 210, 210.5, or 211.5 whistles. The high-pitched 210 is quiet to its user, good for close work, and features a weatherproof pea which provides a unique \\\"trill\\\" sound, making it ideal to distinguish from other commands associated with other sounds. The 201.5 offers a very high pitch and is also quiet to the user, but offers a single frequency without a pea making it a great multipurpose whistle for both close and distance use. Ideal for use at a distance, the 211.5 does not have a pea and features a single-frequency, medium-high pitch. All models feature a metal ring for easy attachment. Imported. 8cm L x 1cm W.