This 12" Straight Tube, 4 Arm Tree Perc Bong w/ Diffused Downstem has dual perc design. It features a removable diffused downstem to begin the filtration process. After the smoke has filtered through the main chamber, the diffusion process continues through the 4 arm tree perc. Each of the 4 arms has diffusion slits. This bong also features a 3-pinch ice catcher, a flared mouthpiece, and clear glass throughout the entire body. This 12" Straight Tube, 4 Arm Tree Perc Bong w/ Diffused Downstem gives amazingly smooth hits thanks to its dual perc design. It features a female removable diffused downstem to begin the filtration process. After the smoke has filtered through the main chamber, the diffusion process continues through the 4 arm tree perc. Each of the 4 arms has diffusion slits. This bong also features a 3-pinch ice catcher, a flared mouthpiece, and clear glass throughout the entire body.