Every Opti regatta requires the sailor to have a whistle attached to them. Here is the classic English ACME plastic whistle at a low price. You may as well have your Opti sailor always have a whistle. IODA Class Rule 4.2 (a) The helmsman shall wear adequate personal buoyancy. A whistle shall be carried securely attached to the personal buoyancy device. Availability: Usually ships the next business day. ACME Plastic Safety Whistle SO33Regular price: $2.49Sale price: $1.99 Availability: Usually ships the next business day. 10 Pack of ACME Whistles SO33-10Regular price: $19.99Sale price: $15.99 Due to the wide variety of the size and weight of our items we will charge the actual cost of shipping in a separate charge on all orders. Please email us for a shipping cost estimate. Shipments outside the USA may have add on fees and duties by your own government. Sailing can be green! See our recycle your old sail offer Send us email