These Optimist buoyancy pads are made of a high quality flexible PVC sheet. Suitable for all non IOD\'95 Optimists and other classes. Can be used inside GRP tanks or with straps. Dimensions inflated 24 cm x 92 cm, content 43 liters, white color. Please note, so as not to inflate the Optimist buoyancy bags too much. When the buoyancy bags are properly filled, they will feel soft to the touch. Over-inflated Optimist buoyancy bags can burst when heated by the sun or rising temperatures. Make sure there are no sharp points in your boat that could catch or puncture the buoyancy bags.