The tips come with two sink rates- the back half of the tip is a slower sink than the front half, for a more level sink to the fly. This is as designed by Ed.
Rod size 2-6---Riffle Tips=Yellow-12'-T8 (96grns) in S2/3, S3/4, S5/6
Rod size 5-8---Run Tips=Light Blue-12-T11 (132grns) in S2/3, S5/6, S8/9
Rod size 7-10---Bucket Tips=Tan-12'-T14 (168grns) in S2/3, S5/6, S8/9