Black HDPE marine grade, high density polyethylene plastic that won't delaminate, rot or splinter. 
This spacer is designed to be bolted to your motor mount accessory. It comes with X1 8" x 2 3/4" composite motor mount spacer, X4 nuts/bolts for install and is pre-drilled but you will have to drill your motor mount holes AFTER you have leveled your motor mount as shown in our install video.
Weight = 0.515 kg / 1.135 lb