Lancet system for pain-reduced blood withdrawal comprising an impulse generator which exerts an impulse on a body part in a sequence which is synchronized with the movement of a lancet. The composition includes a hydrophilic first component and a polymeric second component mixed with the hydrophilic first component. A value obtained by dividing a movement speed of the surface at the time of rotation of the developer carrier by a pitch of the concave portions in a peripheral direction of the developer carrier is smaller than the number of vibrations of the contact member when a loss tangent obtained by dividing a loss elastic modulus of the contact member by a storage elastic modulus is the greatest. When the first reactant flow reaches a minimal, predetermined amount, a second reactant flow is initiated and increased while the carrier gas flow is decreased so as to continue a constant total gas flow. The pair of protrusions 12 protrude toward a pair of metal molds for molding the outer molding portion, respectively. Even filter loading allows more of the volume of the filter to be used, extending filter life.