JL Audio M6-650X coaxial speakers (165 mm).

JL Audio M6-650X 2-Way coaxial speakers 6.5" (165 mm) - M6-650X-S-GwGw, Gloss White Trim Ring, Gloss White Sport Grille.

M6 6.5-inch Marine Coaxial Speakers (75 W, 4 Ω) - Gloss White Trim Ring, Gloss White Sport Grille Purpose-engineered and built for real marine duty. 
M6 coaxial systems deliver maximum audio performance in any open-air boating environment. 
The long excursion woofer design and excellent power handling make your music come through loud and clear at speed, or at anchor. 
A 0.8-inch pure silk dome tweeter, specially treated to withstand the marine environment, handles the high-frequency duties. 

You will appreciate the clean, articulate high-frequency response of the M6 dome tweeter, especially at higher volume levels. 
A true 2-way passive crossover network is built into the terminal assembly to protect it from vibration and corrosion. 
Although M6-650-X Coaxial Systems can be used with as little as 25 W per channel, for best audio performance we recommend amplifiers capable of between 75-150 W of continuous power per channel.