SPK is an innovative system developed by P tect tapes with the support of professional sailors to hoist gennaker and spinnaker much safer and to respect the environment. Today there are various solutions to pack these sails, some very epensive, others less safe. In designing the product, special a ention has been devoted to the material and the choice went to of bu ons made of recycled materials. They must be applied to the lu tape of the sails.